Summarize the following court judgment. il Appeals Nos. 469	 470	506	 507 and 529 to 534 of 1962. Appeals by special leave from the judgment and order dated December 18	 1961	 of the Madhya Pradesh High Court in Misc. Petition Nos. 24	 29	 42	 to 45	 58	 70	 95 and 213 of 1960. WITH Petitions Nos. 70 and 71 of 1962. Petition under article 32 of the Constitution of India for enforcement of Fundamental rights. Sachin Chaudhri	 B. Sen	 J. B. Dada chanji	 O. C. Mathur and Ravinder Narain	 for the appellants (in C. As. 469 and 470/62) and the Petitioners (in Petitions. Nos. 70 and 71 of 62). A. V. Viswanatha Sastri	 R. Ganapathy Iyer and G. Gopalakrishnan	 for the respondent (in C. As. 469 470	 506 and 507 of 62)	 Respondents Nos. 1 and 3 (in C. As. 529 to 534/62) and Respondent No. 1 (in Petn. Nos. 70 and 71/62). B. Sen and I. N. Shroff	 for the appellants (in C. As. 506 and 507/62). 175 N. C. Chatterjee	 Y. section Dharmadhikaree and M. section Gupta	 for the appellants (in C. As. 529 to 534 of 62). I. N. Shroff	 for the respondents Nos. 2 and 4 (in C. As. 529 to 534 of 62). September 24. The judgment of the Court was delivered by GAJENDRAGADKAR	 J. These ten appeals and two writ petitions have been placed for hearing together in a group	 because they raise common questions of law. The appellants in these matters are all colliers holding mining leases under the Government of Madhya Pradesh for the extraction of coal from collieries situated in the Chhindwara District. The respondent	 Janapada Sabha	 Chhindwara	 has issued notices against them calling upon them to pay coal tax " 'for coal manufactured at the mines	 sold for export by rail or sold otherwise than for export by rail within the jurisdiction of the original Independent Mining Board for the said area It appears that the mining area in question was within the territorial limits of the Independent Mining Local Board which had the status and powers of a District Council under the Central Provinces Local Self Government Act	 1920 (hereinafter called the Act). The respondent Sabha is the successor of the said Mining Board and	 therefore	 claims to be entitled to continue the levy and recover the tax in question. On March 12	 1935	 the Mining Board exercising its powers under section 51 of the Act	 resolved to levy coal tax	 and accordingly	 the first imposition made by it received the sanction of the local Government on December 16	 1935	 as per Notification No. 8700 2253 D VIII. This notification came 'into force from January 1	 1936. On December 16	 1935	 the local Government notified the rules for the assessment and 176 collection of the tax which it had framed in exercise of the powers conferred on it by section 79 (1)	 clauses (xv)	 (xix) and (xxx). Rule 2 of these Rules provided that the tax shall be payable by every person	 firm or company holding a mining lease for coal within the limits of the Independent Mining Local Board 's jurisdiction. Rule 3 provided that the tax shall be levied @ three pies per ton on coal	 coal dust or coke manufactured at the mines	 sold for export by rail or sold otherwise than for export by rail within the territorial jurisdiction of the Independent Mining Local Board. In 1943	 the words " 'coke manufactured at the mines" were deleted from Rule 3 and the tax was confined to coal and coal dust. The rate thus prescribed was increased from time to time. On December 22	 1943	 the rate was made 4 pies per ton; on July 29	 1946	 it was made 7 Pies	 per ton; and on July 1. 9	 1947	 it was made 9 pies. The Mining Board continued to recover the tax at the said rates until the Act was repealed in 1948 and in its place was enacted the Central Provinces and Berar Local Self Government Act	 1948 (No. 38 of 1948). The respondent Sabha has now taken the place of the said Mining Board and has issued the notices against the several appellants	 calling upon them to pay the coal tax for the different periods mentioned in the said notices. The appellants in Civil Appeals Nos. 469 and 470 of 1962 are : The Amalgamated Coalfields Ltd. and The Pench Valley Coal Co. Ltd. They are companies in operated under the Indian Companies Act	 1913	 andor both have Shaw Wallace & Co.	 Ltd.	 as their Managing Agents. On August 23	 1958	 notices were served on the two appellants calling upon them to pay Rs. 21	898/ 64 np and Rs. 11	838/9 np respectively as tax assessed @ 9 pies per ton from 		January 1	 1958	 to June 30	 1958: This tax was claimed in respect of coal which included coal despatched by the appellants outside the State of 177 Madhya Pradesh. The validity of these notices was challenged by the appellants in this Court by their Writ Petition 'No. 31 of 1959. On February 10	 1961	 the said writ petition was dismissed by this Court and it was held that the notices served on them were valid (Vide The Amalgamated Coalfields Ltd. vs The Janapada Sabha	 Chhindwara(1). On September 13	 1960 and March 2	 1961	 two notices of demand were served on the appellants calling upon them to pay Rs. 1	16	776/25 nP. and Rs. 65	261/19 nP. respectively in regard to the tax assessed @ nine pies per ton on all coal despatched by the appellants from their collieries for the half years ending June 30	 1958. December 31	 1958	 June 30)	 1959	 December 31 1959	 June 30	 1960 and December 31	 1960. The appellants challenged the validity of these notices by a Writ Petition filed by them in the High Court of Madhya Pradesh on April 1.2	 1961 (No. 95 of 1961). Whilst the said writ petition was pending before the High Court	 the appellants filed another writ Petition in the same High Court (No. 213 of 1961). By this writ petition	 the appellants challenged the validity of notices issued against them on June 9	 1959	 by which coal tax was demanded from them for a period between April 1	 1951 to December 31	 1957. This tax was levied in respect of coal despatched by the appellants outside the State of Madhya Pradesh. The amounts demanded were Rs. 1	92	144/66 nP. and Rs. 68	319/36 nP. respectively. These two petitions along with eight others were heard together by the High Court. So far as the appellants ' petitions were concerned	 the High Court has held that the appellants ' claims were barred by res judicata by reason of the earlier decision of this Court in the case of the Amalgamated Coalfields Ltd. (1). The appellants then applied for and obtained special leave from (1) ; 178 this Court on April 23	 1962 and it is by special leave thus granted to them that they have come to this Court in Civil Appeals 469 & 470 of 1962. The appellants have also filed two Writ Petitions Nos. 70 & 71/1962 under article 32 of the Constitution. By these writ petitions	 the two appellants challenged the validity of the notices served on them on Julie 9	 1959 as well as on September 13	 1960. The appellants ' case is that these notices are illegal and without jurisdiction and so	 they want them to be quashed by an appropriate writ or order issued against the respondent in that behalf. Thus	 the two appellants	 the Amalgamated Coalfields Ltd.	 and the Pench Valley Coal Co. Ltd.		 arc concerned with the two appeals Nos 469 & 470/1962) and Writ Petitions 70 & 71/1962. The other appeals arise from the writ petitions filed in the High Court of Madhya Pradesh by the respective appellants which were tried along with the writ petitions filed by the Amalgamated Coalfields Ltd. & Anr. In dealing with these writ petitions	 High Court has held that the decision of this Court is the case of Amalgamated Coalfields Ltd.(1) concludes the points raised by them in challenging the validity of the notices	 and so	 following the said decision	 the High Court has dismissed all the said petitions. The appellants applied for and obtained special leave to come to this Court against the said decisions and it is with the special leave thus granted to them that these appellants have come before us. Civil Appeal No. 506 arises from the decision of the High Court of 'Madhya Pradesh dismissing the writ petition filed before it by the appellant	 the Central Provinces Syndicate (P) Ltd. By its writ petition the appellant had challenged the validity of the notice served by the respondent calling upon it to pay arrears of the tax amounting to Rs. 20	776/88 nP. being arrears from April 1	 1951 to June 30	 1959. (1) ; 179 It appears that for the said period	 the appellant had been taxed by the respondent	 but the said tax was not imposed on coal which had been transported by the appellant outside the limits of the State of Madhya Pradesh. The respondent now sought to reopen the assessment levied against the appellant for that period by including a claim for tax in respect of coal sold by the appellant outside the limits of the State. The High Court has rejected the Writ Petition and that decision 'has given rise to Civil Appeal No. 506 of 1962. Civil Appeal No. 507 of 1962 arises from a writ petition filed by the appellants M/s. Kanhan Valley Coal Co. (Private) Ltd.	 in the High Court of Madhya Pradesh in which the validity of the notice issued by the respondent calling upon the appellants to pay the coal tax amounting to Rs. 10	970/ as arrears from April 1	 1951 to June 30	 1959 has been challenged. The High Court has dismissed the writ petition	 and so	 the appellants have come to this Court by their Appeal No. 507/1962. Civil Appeals Nos. 529 to 534 of 1962 similarly arise out of six writ petitions filed by the appellants M/s. Newton Chickli Collieries (P) Ltd. & five others in the High Court of Madhya Pradesh challenging the validity of the notices of demand served on them to recover by way of arrears coal tax for the periods mentioned in the notices in regard to coal sent by them outside the State of Madhya Pradesh for export. These writ petitions were dismissed by the High Court	 and the appellants have	 therefore	 come to this Court by appeals Nos. 529 534/1962. That	 in brief	 is the genesis of the ten appeals and two writ petitions which have been grouped together for hearing in this Court. It will thus be seen that Civil Appeals Nos. 469 & 470/1962 and Writ Petitions Nos. 70 & 71/1962 raise a preliminary question about the applicability 180 of the doctrine of res judicata to writ petitions filed under article 226 or to petitions under article 32	 whereas the said appeals and writ petitions as well as the other appeals raise an additional question about the validity of the notices issued against the respective appellants. We would	 therefore	 deal with civil appeals Nos. 469 and 4 70/1962 and Writ Petitions Nos. 70 and 71/1962. Our decision in these matters will govern the other appeals in this group. The first point which falls for our decision	 in these appeals is one of res judicata. The High Court has held that the challenge made by the appellants against the validity of the demand notices issued against them by the respondent is barred by res judicata by virtue of the decision of this Court in the earlier case brought by the appellants themselves before this Court. The Amalgamated Coalfields Ltd.(1) Before dealing with this point it is necessary to refer to the said decision. In that case	 the validity of the impugned notices was challenged on two grounds ; it was urged that the levy of the tax by the Independent Mining Board was invalid at the date of its initial imposition in 1935 and so	 the respondent Sabha which was the successor of the said Mining Board could claim no authority to continue the said tax. This contention was based on the assumption that before the power conferred by section 51 of the Act could be exercised		 the previous sanction of the Governor General had to be obtained	 or that there should be fresh legislation in that behalf. This Court held that the Act having received the assent of the Governor General	 its validity cannot be challenged in view of the saving clauses in the proviso to section 80A (3) and section 84(2) of the Government of India Act	 1915. That being so	 it was not open to any party to suggest that any subsequent amendments of the Government of India Act could affect the continued validity and operation of the Act. The second contention raised was one of construction. It was urged (1) ; 181 that on a fair construction of section 51	 the coal tax was excluded from the purview of the local authority. The This argument was based on the opening clause of section 51 which provided that its provisions would operate subject to the provision of any law or enactment for the time being in force. It was suggested that this clause took in the provisions of section 80A(3) of the Government of India Act read with the Scheduled Taxes Rules framed under that section	 but this argument was also rejected. It appears that at the hearing of the petition	 the appellants also attempted to take an additional point against the validity of the. impugned notices on the ground that the rate of tax which had been increased from 3 pies to 9 pies per ton was invalid. The appellants ' case was that this increase was effected after the commencement of the Government of India Act	 and so	 it was invalid. This argument was not considered by the Court	 because it was not even hinted in the petition filed by the appellants and the Court thought that it would not be proper to permit the appellants to raise that point at that stage. That is how the appellants ' challenge to the validity of the impugned notices served on them on August 23	 1958 was repelled and the writ petition filed by them in that behalf was dismissed. It appears that the authority of the Janapada Sabha to levy the impost under s.51 of the Act was challenged on another ground in the case of Ram Krishna Ram Nath v	 Janapad Sabha (1). This time the attack against the competence of the janapad Sabha proceeded on the ground that in repealing the Act of 1920	 the subsequent Act of 1948 had not provided for the continuance of the said power in the janapad Sabhas which were the successors of the Independent Mining Boards. Section 192(c) purported to provide that all rates	 taxes and cesses due to the District Council	 Local Board or Independent Local Board shall be deemed to be due to the Sabha to (1) [1962] Supp. 3 S.C.R. 70. 182 whose area they pertain. But it was obvious that this clause could apply to	 and save	 only rates	 taxes and cesses already due; it did not authorise the imposition of fresh cesses	 taxes or rates in future. Having realised that the relevant provision did not save future imposts	 an amending Act was passed in 1949 by which the said saving was extended to include the right of the janapad Sabhas to continue the levy of the impugned tax and this amendment was made retrospective f from June 11	 1948	 when the parent Act had come into force. In the case of Ram Krishna (1) the validity and effectiveness of this amendment of 1949 was challenged. It was thus a basic challenge to the power of the janapad Sabhas to levy any impost on the ground that the subsequent amendment was invalid. This Court repelled the said challenge and held that the retrospective operation of the amendment was valid. According to this decision	 the Provincial Legislature was competent to legislate for the continuance of the tax	 provided the relevant conditions of s.143(2) of the Government of India Act 1935 were satisfied. These conditions required that the tax should be one which was lawfully levied by a local authority for the purposes of a local area at the commencement of Part III of the Government of India Act; that the identity of the body that collects the tax	 the area for whose benefit the tax is to be utilised and the purposes for which it is to be utilised continue to be the same	 and that the rate of the tax is not enhanced nor is its incidence materially altered	 so that	 in substance	 it continues to be the same tax. Since these tests were satisfied by the impost levied by the janapad Sabha	 it was held that the impost was valid and that the retrospective amendment of s.192 was effective. The present proceedings constitute a third challenge to the validity of the notices issued by the janapad Sabha	 and as we have already seen	 the (1) [1962] Supp. 3 S.C.R. 70. 183 challenge made by the appellants by their writ petitions before the High Court has been repelled on the preliminary ground that it is barred by res judicata. In that connection	 the first question to consider is whether the general principle of res judicata applies to writ petitions filed under article 32 of the Constitution. This question has been considered by a special Bench of this Court in the case of Pandit M. section M. Sharms vs Dr. Shree Krishna Sinha (1). Chief justice Sinha	 who delivered the unanimous opinion of the Court	 has answered this question in the affirmative. In that connection	 the learned Chief justice has referred to an earlier decision of this court in Raj Lakshmi Dasi vs Banamali Sen	 (2) where it has been laid down that the principle underlying res judicata is applicable in respect of a question which has been raised and decided after full ' contest	 even though the first Tribunal which decided the matter may have no jurisdiction to try the subsequent suit and even though the subject matter of the dispute was not exactly the same in the two proceedings. It ought to be added that the Tribunal which had tried the first dispute in that case was a Tribunal of exclusive jurisdiction. Then the points raised on behalf of the petitioner Sharma were considered and it was noticed that	 in substance	 they were the same points which had been agitated before this Court on an earlier occasion and had been rejected. "In our opinion"	 said the judgment	 "the questions determined by the previous decision of this Court cannot be reopened in the present case and must govern the rights and obligations of the parties which as indicated above	 are substantially the same. " Thus	 this decision shows that even petitions filed under article 32 are subject to the general principle of res judicata. The question about the applicability of the doctrine of res judicata to the petitions filed under (1) (2) ; 184 article 32 came before this Court in another form in Daryao vs The State of U. P. (1)	 and in that case it has been held that where the petition under article 226 is considered on the merits as a contested matter and dismissed by the High Court	 the decision pronounced is binding on the parties	 unless modified or reversed by appeal or other appropriate proceedings under the Constitution	 and so	 if the said decision was not challenged by an appropriate remedy provided by the Constitution	 a writ petition filed in respect of the same matter would be deemed to be barred by res judicata. Therefore	 there can be no doubt that the general principle of res judicata applies to writ petitions filed under article 32 or article 226. It is necessary to emphasise that the application of the doctrine of res judicata to the petitions filed under article 32 does not in any way impair or affect the content of the fundamental rights guaranteed to the citizens of India. It only seeks to regulate the manner in which the said rights could be successfully asserted and vindicated in courts of law. The question in the present appeals	 however	 is somewhat different. The notices which are challenged by the appellants in the present proceedings are in respect of the tax levied for a period different from the period covered by the notices issued on August 23	 1958 which were the subject matter of the earlier writ proceedings (The Amalgamated Coalfields Ltd. ( 2 ) ) . Where the liability of a tax for a particular year is considered and decided	 does the decision for that particular year operate as res judicata in respect of the liability for a subsequent year ? In a sense	 the liability to pay tax from year to year is a separate and distinct liability; it is based on a different cause of action from year to year	 and if any points of fact or law are considered in determining the liability for a given year	 they can generally be deemed to have been considered and decided in a collateral and incidental way. The (1) ; (21 ; 185 trend 'of the recent English decisions on the whole appears to be	 in the words of Lord Radcliffe	 '		that if is more in the public interest that tax and rate assessments should not be artificially encumbered with estoppels (I am not speaking	 of course	 of the effect of legal decisions establishing the law	 which is quite a different matter)	 even though in the result	 ' some expectations may be frustrated and some time wasted." (vide Society of Medical Officers of Health vs Hope Valuation Officer (1)). The basis for this view is that generally	 questions of liability to pay tax are determined by Tribunals with limited jurisdiction and so	 it would not be inappropriate to assume that if they decide any other questions incidental to the determination of the liability for the specific period	 the decisions of those incidental questions need not create a bar of res judicata while similar questions of liability for subsequent years are being examined. In that connection	 it would be interesting to refer to four English decisions. In the case of Broken Hill Proprietary Co. Ltd. and Municipal Council of Broken Hill	 (2) the question which fell for decision was how the average annual value of a mine for rating purposes had to be determined	 and it was held by the Privy Council that the said value was to be ascertained by dividing the value of the output during the three years by three	 not by multiplying it by 205 and dividing it by 365. One of the points which the Privy Council had to consider was whether a contrary decision reached by the High Court of Australia between the parties as to the valuation for a previous year	 operated as res judicata. In rejecting the plea that the principle of res judicata applied	 Lord Carson. observed that ""the decision of the High Court related to a valuation and a liability to a tax in a previous year	 and no doubt as regards that year	 the decision could not be disputed. The present case relates to a new question	 viz.	 the valuation for a different year and the liability for that year. It is not (1) 	 563	 (2) 186 eadem questio	 and therefore	 the principle of res judicata cannot apply." (p. 100). It	 however	 appears that in the same year	 the Privy Council came to a somewhat contrary decision in the case of Hoystead vs Commissioner of Taxation.(1) In that case	 the question which arose for decision was about the deduction claimable under ther elevant provision of the Land Tax Assessment Act	 1916 (Aust.) Upon the assessment for 1919 20	 the Commissioner allowed only one deduction of 5	000 lbs. contending that the beneficiaries were not joint owners within the meaning of the Act. The case was then stated to the full Bench which upheld the Commissioner 's view and rejected the argument that the Commissioner was estopped from coming to that conclusion in view of his decision in a previous year. When the matter went before the Privy Council	 it reversed the decision of the Full Court	 because it held that the Commissioner was estopped	 even though in the previous litigation no express decision had been given whether the beneficiaries were joint owners	 it being assumed and admitted that they were	 and the Privy Council thought that the matter so admitted was fundamental to the decision then given. It would thus be seen that this decision applied the principle of res judicata even where there was no express decision on the point	 but the point had been conceded in the earlier proceedings. In 1960	 the House of Lords had occasion to consider this question in the case of Society of Medical Officer of Health (2). We have already quoted one statement of 'the law from the speech of Lord Radcliffe in that case. In that case	 the main reason given for repelling the application of the principle of res judicata in rating cases	 was that the jurisdiction of the Tribunal which deals with those cases is limited	 in that its function begins with and ends with deciding the assessment or liability of a person for a terminable period. Besides	 it was (1) (2) 	 563. 187 held that the position of a valuation officer is that of a neutral official charged with the recurring duty of bringing into existence a valuation list	 and he cannot properly be described as a party so as to make the proceedings a lis inter partes. In coming to the conclusion that the doctrine of res judicata would not apply in such cases	 Lord Radcliffe was influenced by the consideration that if decisions in rating cases are to be treated as conclusive for all time that Would be to impose a needlessly heavy burden upon the administration of rating (p.566). This decision purported to approve of the view taken in the case of the Broken Hill Proprietary Co. Ltd.(1) and to distinguish the view taken in the Hoystead case. (2) Lord Radcliffe had occasion to return to the same subject again in Gaffoor vs Income tax Commissioner. (3) Speaking for the Privy Council	 Lord Radcliffe considered the problem of the application of res judicata to taxation cases	 examined it in detail and came to the conclusion that the said doctrine did not apply to tax cases in the sense that the decision for the levy of a tax for one year does not operate as res judicata in dealing with the question of a tax for the subsequent year. On this occasion	 emphasis was not placed so much on the limited nature of the jurisdiction of the Tribunal that deals with tax cases	 but it was held that even if the matter goes to a High Court on a statement of the case	 the decision of the High Court would also not create a bar of res judicata in dealing with the tax claim for a subsequent year. " 'The critical thing	 said Lord Radcliffe,  'is that the dispute which alone can be determined by any decision given in the course of these proceedings is limited to one subject only	 the amount of the assessable income for the year in which the assessment is challenged. " He	 no doubt	 recognised that in the process of arriving at the necessary decision	 it was likely that the consideration of questions of law turning upon the construction of the ordinance or of other statutes or (1) (2) 	 (3) [1961] 2 W.L.R.794. 188 upon the general law	 may be involved	 but he thought that the decision of those questions should be treated as collateral or incidental to what is the only issue that is truly submitted to determination (pp. 800 801). This decision would	 therefore	 support the appellants ' contention that the High Court was in error in dismissing their writ petitions on the preliminary ground that they were barred by res judicata. In considering this question	 it may be necessary to distinguish between decision on questions of law which directly and substantially arise in any dispute about the liability for a particular year	 and questions of law which arise incidentally or in a collateral manner	 as Lord Radcliffe himself has observed in the case of the Society of Medical Officers of Health	 (1) that the effect of legal decisions establishing the law would be a different matter. If	 for instance	 the validity of a taxing statute is impeached by an assessee who is called upon to pay a tax for a particular year and the matter is taken to the High Court or brought before this Court and it is held that the taxing statute is valid	 it may not be easy to hold that the decision on this basic and material issue would not operate as res judicata against the assessee for a subsequent year. That	 however	 is a matter on which it is unnecessary for us to pronounce a definite opinion in the present case. In this connection	 it would be relevant to add that even if a direct decision of this Court on a point of law does not operate as res judicata in a dispute for a subsequent year	 such a decision would	 under article 141	 have a binding effect not only on the parties to it	 but also on all courts in India as a precedent in which the law is declared by this Court. The question about the applicability of res judicata to such a decision would thus be a matter of merely academic significance. In the present appeals	 the question which arises directly for our decision is : does the principle (1) 	 563. 189 of constructive res judicata apply to petitions under article 32 or article 226 where the dispute raised is in respect of a year different from the year involved in a prior dispute decided by this Court ? We have already noticed the points actually decided by this Court against the appellants on the earlier occasion (vide The Amalgamated Coalfields Ltd.(1)). One of the points sought to be raised was in regard to the validity of the increase in the rate of tax from 3 pies to 9 pies per ton; and since this point had not been taken in the petition and relevant material was not available on record	 this Court refrained from expressing any opinion on it. The appellants contend that the order passed by this Court refusing permission to the appellants to raise this point on the earlier occasion does not mean that this Court has decided the point on the merits against the appellants; it may mean that the appellants were given liberty to raise this point later: but even otherwise	 the point has not been considered and should not be held to be barred by constructive res judicata . It is significant that the attack against the validity of the notices in the present proceedings is based on grounds different and distinct from the grounds raised on the earlier occasion. It is not as if the same ground which was urged on the earlier occasion is placed before the Court in another form. The grounds now urged are entirely distinct	 and so	 the decision of the High Court can be upheld only if the principle of constructive res judicata can be said to apply to writ petitions filed under article 32 or article 226. In our opinion	 constructive res judicata which is a special and artificial form of res judicata enacted by section 11 of the Civil Procedure Code should not generally be applied to writ petitions filed under article 32 or article 226. We would be reluctant to apply this principle to the present appeals all the more because we are dealing with cases where the impugned tax liability is for different years. In dismissing the appellants ' petitions on the ground of res judicata	 the High Court has no doubt referred to (1) ; 190 article 141 under which the law declared by this Court is binding on all Courts within the territory of India. But when we are considering the question as to whether any law has been declared by this Court by implication	 such implied declaration	 though binding must be held to be subject to revision by this Court on a proper occasion where the point in question is directly and expressly raised by any party before this Court. Therefore	 we are inclined to hold that the appellants cannot be precluded from raising the new contentions on which their challenge against the validity of the notices is based. The first. ground urged by the appellants on the merits is that the levy authorised to be imposed by the Act and the Rules framed thereunder violates the fundamental rights guaranteed to the citizens under article 19 (1) (f) of the Constitution	 and in support of this Arguments reliance is placed on the decision of this Court in Kunnathat Thathunni Moopil Nair vs The State of Kerala (1). In that case	 the impugned Act was struck down because it suffered from several serious infirmities; it was confiscatory in character and its provisions in regard to the levy of the impost were so arbitrary and unreasonable that the Court took the view that the Legislature had completely ignored the legal position that the assessment of a tax on person or property was at least of a quasi judicial character. This conclusion was based on the examination of the relevant statutory provisions. in the present case	 we are not satisfied that this decision can assist the appellants at all	 because the nature of the statutory provisions and the Rules framed under the Act in the present appeals is entirely different. At this stage	 it is necessary to refer to the relevant statutory provisions and the Rules. Section 51 of the Act (which	 in substance	 corresponds to section 90 of the Act of 1948) reads thus (1) ; 191 "51. (1) Subject to the provisions of any law or enactment for the time being in force	 a District Council may	 by a resolution passed by a majority of not less than two thirds of the members present at a special meeting convened for the purpose	 impose any tax	 toll or rate other than those specified in sections 24	 48	 49 and 50. (2) The first imposition of any tax	 toll or rate under sub section (1) shall be subject to the previous sanction of the Provincial Government. x x x X" Sub section (3) and the proviso are not relevant for our purpose. Then we go to section 79 which confers power on the Provincial Government to make Rules. Section 79 (1)(xv) is relevant for our purpose. It provides that : "The Provincial Government may make rules consistant with this Act and with reference	 if necessary	 to the varying circumstances of different local areas	 as to the assessment and collection of the cases and rates specified in sections 48	 49 & 50 and of any tax	 toll or rate imposed under section 51	 as to the maximum amounts or rates at which any of them may be imposed	 as to the prevention of evasion of assessment or payment thereof	 as to the agency by which they shall be assessed and collected	 and as to the manner in which account thereof shall be rendered by District Councils. " In pursuance of the powers conferred on the local Government by section 79	 rules have been framed on December 16	 1935. Rules 3 to 10 deal with the question of the impost of tax and provide how decisions made in that behalf by appropriate authorities 192 become final. Rule 3 prescribed the rate at 3 pies per ton	 Rule 4 provides that the figures reported by the concessionaires and the Railway companies half yearly to the Dy. Commissioner	 shall be the basis for the assessment of the tax. Under Rule 5	 every mining lessee has to submit a statement half yearly. On receipt of the statement	 the assessment has to be made by the Chairman of the Independent Mining Local Board under Rule 6. A notice of demand follows under rule 7. Fifteen days ' period is given for filing objections under Rule 8. Rule 9 provides for the Consideration and disposal of the objections	 and Rule 10 lays down that if no objection is filed	 the Chairman 's assessment shall be final	 if any objection is received	 the Independent Mining Local Board 's decision shall be final and shall be communicated to the assessee as soon as possible. It would thus be seen that the scheme of these Rules provides ample opportunity to the assessees to object to the notice of demand served on them and in fact	 the demand notices are substantially based on the figures supplied by the railway companies and the concessionaires and the statements submitted by the assessees themselves. Therefore	 it would be idle to suggest that the impost of the tax authorised by the relevant statutory provisions and the Rules is a capricious administrative or executive affair and so	 should be held to violate article 19(1)(f) of the Constitution. Then it is urged that the demand of the tax @ 9 'es per ton is invalid	 because it is inconsistent with Rule 3 which has prescribed the maximum rate permissible to be levied against the assessees. We have already noticed that section 79(1)(XV) authorised the making of a rule as to the maximum amounts or rates at which any of the articles can be taxed. This was introduced by an amendment made in 1933 by C.P. Act VII of 1933	 and so	 the argument is that Rule 3 which provides that the tax shall be levied @ 3 pies per ton must be deemed to pro 193 vide for the maximum rate which can be levied and that is 3 pies per ton and no more. This argument is no doubt well founded.	 because Rule 3 will have to be read in the light of the power conferred on the local Government by section 79(XV) and that would mean that the rate of 3 pies per ton has been prescribed by the Rule of the maximum rate permissible. But this argument ignores the fact that this Rule has been subsequently deleted by a notification on September 6	 1943 published in the Government Gazette on September 10	 1943. When this notification was cited before us	 the appellants conceded that the argument based on the construction of Rule 3 was not available to them. Therefore	 the contention that Rule 3 prohibits the levy at a rate higher than 3 pies cannot succeed since the Rule itself has been subsequently deleted and was not a part of the Rules at the relevant time when the impugned notices were issued. It is then argued that the impost of the tax at the rate of 9 pies per ton is not valid	 because it does not comply with the requirements of section 51(2) of the Act	 and that raises the question of the construction of the said section. Section 51(1) authorises the imposition of the tax	 provided	 of course	 the procedure prescribed by it and the requirements laid down by it are satisfied. Sub Section (2) then lays down that the first imposition of any tax shall be subject to the previous sanction of the Provincial Government. The appellants contend that in the context	 the "first im position" means not only the first imposition in the sense of an initial imposition	 but it includes every fresh imposition levied at an increased rate. On the other hand	 the respondent Sabha contends that the first imposition means only the initial levy or impost and cannot take in subsequent imposts or levies. 'In this connection	 it is relevant to remember that sub section (2) was added by the same Amending Act by which section 79(XV) was amended	 and 194 so	 it would not be unreasonable to assume that when the legislature gave power to the local Government to prescribe by rules the maximum rates permissible to be levied	 it introduced sub section (2) in section 51 because it was thought necessary that whenever the rates were changed	 the imposition of the tax at the increased rates should receive the previous sanction of the Government. If the respondent 's construction is accepted	 it would mean that the respondent should obtain the previous sanction of the Government at the initial levy and thereafter may go on increasing the rate of the levy to any extent without securing the sanction of the Government in that behalf. Now that Rule 3 has been deleted and no maximum has been or can be prescribed by the Rules	 it would be unreasonable to hold that the respondent is given an unfettered and unguided authority to levy the impost in question at any rate it likes. Since no ceiling has been placed by the Rules in that behalf	 it would	 we think be fair to hold that if the rates are increased and levy is sought to be imposed on the altered rates	 the imposition of the levy at these altered rates should be deemed to be included in the express on "first imposition" under section 51(2). We are	 therefore	 inclined to accept the appellants ' construction of section 51(2). That being so	 it is necessary to enquire whether the imposition of the tax @ 9 pies has received the previous sanction of the local Government. During the course of his arguments	 Mr. Sastri for the respondent attempted to suggest that sanction had been obtained for the increase in the rates from time to time and a typed summary of the notifications issued in that behalf was supplied to us at the time of arguments. This summary refers to the three increments made in 1943	 1946 and 1947 respectively to which we have already referred. The summary read as if the increments had been sanctioned by the State Government. But Mr. Sachin Choudhury for the appellants contended that the 195 summary supplied by the respondent was incomplete and inaccurate and that the examination of the Gazette in which the notifications were published	 would show that the amendments in the rates had been made not with the previous sanction of the Government	 but by the Mining Local Board itself. Two of these notifications were then produced before us by the respondent	 and they supported the conten tion made by Mr. Choudhury. Therefore	 the argument that the imposition @ 9 pies per ton has received the sanction of the Government must fail	 and so	 the impugned notices which seek to recover the tax from the appellants @ 9 pies per ton must be held to be invalid The respondent is entitled to levy tax only @ 3 pies per ton because that levy has received the sanction of the Government	 but if the respondent intends to increase the rate of the said tax	 it must follow the procedure prescribed by s.51(2)	 provided of course	 it is open to the respondent to increase the said tax. There is yet another point on which the appellants are entitled to succeed	 and that has reference to the fact that the respondent is seeking to reopen some of the assessments made by it against the appellants. The argument is that once an assessment is made for a specific period	 it becomes final and it is not open to the respondent to demand additional amount by way of tax in respect of the said period. The genesis of the tax is somewhat interesting. It appears that roads were constructed by the Independent Mining Local Board at enormous cost at the request of the Mining interests and even debt had to be incurred by the Board for completing the work of the construction of roads. Since the mining companies received substantial benefit from these roads	 the Legislature thought of levying a tax on coal	 and that is the origin of the tax. When the first notification was issued on December 16	 1935 it authorised and sanctioned the imposition by the Independent 196 Mining Local Board at Chhindwara in the Chhindwara District "of a tax at 3 pies per ton on coal	 coal dust or coke	 manufactured at the mines	 sold for export by rail or sold otherwise than for export by rail	 within the jurisdiction of the Independent Mining Local Board. " This tax was recovered by the Board and thereafter by the respondent in respect of coal whether sold inside the district of Chhindwara or sold outside the district of Chhindwara or even outside the State of Madhya Pradesh. In other words	 the total coal produced by each mining lease holder substantially came to be taxed. But after the Constitution came into force	 doubts arose as to whether article 286 of the Constitution did not preclude the respondent from recovering tax in respect of coal exported out of the State of Madhya Pradesh	 and in view of the advice given to the respondent by the Government of Madhya Pradesh	 the respondent did not collect the tax in respect of coal which was exported by rail outside the State of Madhya Pradesh from about 1952. The respondent wanted to consult legal opinion on this point	 but the State Government refused permission to the respondent to incur expenditure in that behalf. Subsequently however	 this question came to be decided by the High Court of Madhya Pradesh in a writ petition filed by M/s. Newton Chickli Collieries (Pvt. ) Ltd. (No. 265 of 1957). The High Court held that the tax levied by the janapada Sabhas under s.51 of the Act did not amount to a sales tax nor to an excise duty and so	 the respondent thought that it could levy tax even on coal exported by rail outside the State of Madhya Pradesh. In fact after this judgment was pronounced by the High Court on August 6	 1958	 the Provincial Government withdrew its instructions to the respondent not to levy tax on exported coal. That is how the respondent has issued notices against the appellants in respect of coal exported by rail out of the State of Madhya Pradesh in regard to the years for which assessment has already been levied against the 197 appellants for the coal not so exported	 and the contention of the appellants is that this reopening of the assessment is not permissible under the Rules. This contention appears to be well founded. We have already seen the scheme of the Rules and we have noticed that Rule 10 provides that if no objection is filed	 the Chairman 's assessment shall be final and if an objection is received	 the decision of the Mining Board would be final. In other words	 the scheme clearly provides that at the end of each six monthly period	 the tax has to be assessed	 notices to be issued to the assessee	 his objections to be considered and the tax to be ultimately determined in the light of the decision on the said objections; and under Rule 10	 the two decisions specified therein become final. It may be that the Rules do not prescribe any limitation within which these steps have to be taken by the respondent for each period	 but that is another matter. In view of the provisions of Rule 10	 it is difficult to hold that the respondent is entitled to reopen assessments already made and rendered final under the said Rule. There is no other provision for reopening assessment as we have under sections 34 & 35 of the Indian Income Tax Act	 and so	. the respondent is not justified in issuing notices for the years which arc covered by assessment orders already passed. The finality provided for by Rule 10 will work as much against the respondent as against the assessees. In support of the appeals	 another argument was sought to be raised against the increase of the rates. It was urged that the tax is in the nature of an excise duty or a sales tax and	 therefore	 any increase in the said tax beyond the limit of 3 pies the continuance of which has been saved by the provisions of article 143 of the Government of India Act	 1935 and article 277 of the Constitution will be invalid. This argument is based on the terms used 198 in the notification of December 16	 1935. Since coal is described as manufactured at the mines	 the argument is that it is in the nature of an excise duty and since the notification also refers to coal sold for export by rail or sold otherwise than for export by rail	 it is ' argued that it is a sales tax. On the other hand	 the respondent contends that it is neither a sales tax nor an excise duty and as such	 the rate can be increased subject	 of course	 to the requirements of section 51 (2) of the Act. It appears that by notification issued on September 6	 1943	 the preamble of the Rules was modified by substituting for the words " 'coal	 coal dust or coke" by "coal and dust coal" and by deleting the words " 'manufactured at the mines". Curiously enough	 these amendments have not been made in the original notification itself. We have already noticed that this latter notification deleted Rule 3. Some arguments were urged before us by learned counsel on both sides as to the effect of this notification which modified the preamble to the Rules. We do not	 however	 think it necessary to consider these arguments in the present appeals because of our conclusion that the impugned notices levying the tax @ 9 pies per ton are invalid for two reasons: the increase in the rates has not been sanctioned by the State Government under section 51 (2) and an attempt to recover at the increased rate the tax for the years already covered by assessment orders passed in that behalf	 is barred by Rule 10. The result is	 the appeals and the writ petitions are allowed and an appropriate direction or order is issued restraining the respondent from recovering the tax at a rate higher than 3 pies per ton and also restraining the respondent from recovering any additional tax in respect of the years for which tax has already been assessed against the appellants. The same will be the order in the other companion appeals. The 199 appellants will be entitled to their costs	 but one set of bearing fees will be taxed. Appeals and writ petitions allowed.

The 1st appellant in the first batch of appeals had filed a writ petition in this Court challenging the notices calling upon him to pay the tax of 9 pies per ton on coal including coal despatched outside the State of Madhya Pradesh on two grounds	 namely	 that the levy of the tax by the Independent Mining Board was invalid at the date of its initial imposition and	 173 therefore	 the respondent Sabha which was the successor of the Mining Board could not continue the levy and also that on a proper construction of section 51 of the Act	 the levy could not be made. Another point namely	 the increase in the rate of tax from the original 3 pies to the 9 pies per ton at which the tax was demanded was illegal was sought to be canvassed but was not allowed to be argued by the Court as it had not been raised in the petition. The writ petition was rejected. The appellant challenged the levy of the tax for the further periods byway of a writ petition before the High Court of Madhya Pradesh on grounds distinct and separate from those which had been rejected by this Court. The High Court dis missed the writ petition on the ground that it was barred by res judicata by reason of the earlier judgment by this Court. In the case of the other appellants the High Court held that the matter was also concluded on the authority of the decision of this Court. The appellants in the first batch of appeals came by special leave and also filed writ petitions challenging the validity of the levy. Held	 that while the general principle of res judicata applies to writ petitions under article 32 and article 226 of the Constitution	 in its application to article 32 of the Constitution	 the doctrine only regulates the manner in which the fundamental rights could be successfully asserted and does not in any way impair or affect the content of the fundamental rights. Pandit M.S.M. Sharma vs Dr. Shree Krishna Sinha	 [1961] 1 section 0. R. 96	 Raj Lakshmi Dasi vs Banamali Sen	 [1953] section C. R. 154 and Daryao vs State of U.P.	 ; 	 referred to. Constructive res judicata was a creature of statute and its application could not be extended to other proceedings particularly those questioning tax liability for different years. Held	 further	 that the law declared by the Supreme Court which is binding under article 141 of the Constitution of India is that which has been expressly declared and any implied declaration though binding was subject to revision by this Court when the point was subsequently directly and expressly raised before this Court. Held	 further	 that the procedure of assessment of tax authorised by the relevant statutory provisions and the Rules could not be said to be a capricious administrative or executive affair so as to violate article 19(1) (f) of the Constitution. 174 Kunnathat Thathunni Moopil Nair vs State of Kerala	 ; 	 distinguished. As the Rule which prescribed the maximum rate had itself been deleted it could not be said that there had been a levy in excess of the maximum prescribed. As neither the Act nor the Rules prescribed a ceiling on the levy	 the expression "first impositions occurring in section 51(2) would include every increase of the levy after its initial imposition and the increased levy would require the previous sanction of the Local Government and such sanction not being there	 the levy at the rate of 9 pies per ton was illegal. Considering the nature of the tax and the periods for which it was assessed and in the absence of any provision	 the assessment once made by r. 10 was final and there could be no re assessment.