Summarize the following court judgment. Appeal No. 870 of 1966. Appeal by special leave from the judgment and order dated June 14	 1965 of the Bombay High Court in Special Civil Application No. 371 of 1965. section section Shukla	 for the appellant. M. C. Bhandare	 K. Rajendra Chaudhuri and K. R. Chaudhuri	 for the respondent. The Judgment of the Court was delivered by Grover	 J. This is an appeal by special leave from a judg ment of the division bench of the Bombay High Court. The only question for decision is whether the High Court could interfere under articles 226 & 227 of the Constitution with the order of the appellate court in proceedings under the Bombay Rents	 Hotel and Lodging House Rates Control Act	 1947	 hereinafter called the "Act"	 when a petition for revision under section 115	 Civil procedure Code	 against the same order had been previously dismissed by a single Judge of that court. The appellant is the owner of a house in Poona. The res pondent	 who was a teacher	 was the tenant of a block of four rooms on the first floor of the house. In 1958 he was transferred to another town Wai where he was allotted suitable residential accommodation. His son	 however	 stayed on in Poona as he was studying there. The appellant filed a suit in the court of Judge	 Small Causes	 under the provisions of the Act for possession of the suit premises	 inter alia	 on the ground that the respondent had acquired suitable accommodation elsewhere. The position taken up by the respondent was that his son was required to stay on in Poona and for that reason it could not said that the had acquired suitable residence at Wai. Moreover he had gone away from Poona only temporarily and on his return the pre mises would be required for his own use. The trial court held that only a part of the premises which were required by the son should be vacated. It granted a decree for possession of two out of four rooms and directed proportionate reduction of the rent. Both sides filed appeals in the court of the District Judge. The Extra Assistant Judge who disposed them of was of the view that the court was not empowered to bifurcate the premises. It was either suitable for the whole family or it was not suitable. But 324 he affirmed the decree on the ground that the order of the trial court was an equitable one. The respondent preferred a petition for revision under section 1 15 of the Code of Civil Procedure before the High Court. A learned Single Judge who heard the petition dismissed it as he was not satisfied that the appellate court had acted in exercise of its jurisdiction illegally or with material irregularity. The respondent moved a petition under articles 226 and 227 of the Constitution challenging the same order of the appellate court. Following a decision of a full bench in K. B. Sipahi malani vs Fidahussein Vallibhoy(1) the division bench which heard the writ petition held that in spite of the dismissal of the petition by the learned Single Judge there could be interference under articles 226 and 227 of the Constitution on a proper cast being made out. After going into the merits the bench expressed the view that the respondent had not acquired an alternative suit able residence. The courts below were therefore	. wrong	 in coming to the contrary conclusion. As section 13 (I) (1) of the Act had been misconstrued and the error was apparent on the record the orders of the courts below were set aside. Now as is) well known section II 5 of the Civil Procedure Code empowers the High Court to call for the record of any cast which has been decided by any court subordinate to it and in which no appeal lies to it. It can interfere if the subordinate court appears to have exercised the jurisdiction not vested in it by law or to have failed to exercise the jurisdiction so vested on to have acted in the exercise of its jurisdiction legally or with material illegality. The limits of the jurisdiction of the High Court under this section are well defined by a long course of judicial decisions. If the revisional jurisdiction is invoked and both parties are heard and an order is made the question is whether the orders of the subordinate court has become merged in the order of the High Court. If it has got merged and the order is only of the High Court	 the order of the subordinate court cannot be challenged or attacked by another set of proceedings in the High Court	 namely	 by means of a petition under article 226 or 227 of the Constitution. It is only if by dismissal of the revision petition the order of the subordinate court has not become merged in that of the High Court that it may be open to party to invoke the extraordinary writ jurisdiction of that court. There again the question will arise whether it would be right and proper for the High Court to interfere with an order of a subordinate court in a writ petition when a petition for revision under section 115	 C.P.C.	 against the same order has been dismissed. Such a consideration will also enter into the exercise of discretion in a petition under Aft. 226 or 227	 (1) 58 B.L.R. 344	 325 The Bombay High Court in K. B. Sipahimalani 's (1) case made a distinction between an appellate jurisdiction and a revisional jurisdiction. A right of appeal is a vested right and an appeal is a continuation or a rehearing of the suit. A revision	 however	 is not a continuation or a rehearing of the suit; nor is it obligatory upon the revisional court to interfere with the order even though the order may be improper or illegal. If the revisional court interferes the order of the lower court does not merge in the order passed by a revisional court but the order of the revisional court simply sets aside or modifies the order of the lower court. it was this argument which mainly prevailed before the Bombay bench. It would appear that this Court has taken a view which runs counter to that of the Bombay High Court. Although the case of Madan Lal Rungta vs Secy. to the Government of Orissa(2) was not one which had been decided under section 115 of the Civil Procedure Code but the ratio of that decision is apposite. The State Government of Orissa a rejected the application of the appellant there who had applied for grant of a mineral lease. He made in application for review to the Central Government under Rule 57 of the Mineral Concession Rules which was rejected. He moved the High Court under article 226 of the Constitution which was also dismissed. The appellant came up by special leave to this Court. His main contention was that the Central Government had merely dismissed the review petition and the effective order rejecting his application for the mining lease was that of the State Government. The High Court	 thus	 had jurisdiction to grant a writ under article 226. This contention was negatived and it was held that the High Court was right in taking the view that it had no jurisdiction to issue a writ as the final order was that of the Central Government which was not within its territorial jurisdiction. The ratio of this decision is that it was the order of the Central Government dismissing the review peti tion which was the final order into which the order of the State Government had merged. It would appear that their lordships of the Privy Council regarded the revisional jurisdiction to be a part and parcel of the appellate jurisdiction of the High Court. This is what was said in Nath Dey vs Suresh Chandra Dey(3). "There is no definition of appeal in the Code of Civil Procedure	 but their Lordship have no doubt that any application by a party to an Appellate Court	 asking it to set aside or revise a decision of a subordinate Court	 is an appeal within the ordinary acceptation of the term. " (1) 58 B.L.R. 344. (2) [1962] 3 Supp. S.C.R. 906. (3) 591.A.283	 287. L13Sup. CI/69 7 326 Similarly in Raja of Ramnad vs Kamid Rowthen & Ors. (1) a civil revision petition was considered to be an appropriate form of appeal from the judgment in a suit of small causes nature. A full bench of the Madras High Court in P. P. P. Chidambara Nadar vs C. P. A. Rama Nadar & Ors. (2) had to decide whether with reference to article 182(2) of the Limitation Act	 1908 the term "appeal" was used in a restrictive sense so as to exclude revision petitions and the expression "appellate court" was to be confined to a court exercising appellate	 as opposed to	 revisional powers. After an exhaustive examination of the case law in cluding the decisions of the Privy Council mentioned above the full bench expressed the view that article 182(2) applied to civil revisions as well and not only to appeals in the narrow sense of that term as used in the Civil Procedure Code. In Secretary of State for India in Council vs British India Steam Navigation Company(3) and order passed by the High Court in exercise of its revisional jurisdiction under section 115	 Code of Civil Procedure	 was held to be an order made or passed in appeal within the meaning	 of section 39 of the Letters Patent	 Mookerji	 J.	 who delivered the judgment of the division bench referred to the observations of Lord Westbury in Attorney General vs Sillem(4) and of Subramania Ayyar	 J. in Chappan vs Moidin(5) on the true nature of the right of appeal. Such a right was one of entering a superior Court and invoking its aid and interposition to redress the error of the court below. Two things which were required to constitute appellate jurisdiction were the existence of the relation of superior and inferior Court and the power on the part of the former to review decisions of the latter. In the well known work of Story on Constitution (of United States) vol. 2	 article 1761	 it is stated that the essential criterion of appellate jurisdiction is that it revises and corrects the proceedings in a cause already instituted and does not create that cause. The appellate jurisdiction may be exercised in a variety of forms and	 indeed	 in any form in which the legislature may choose to prescribe. According to article 1762 the most usual modes of exercising appellate jurisdiction	 at least those which are most known in the United States	 are by a writ of error	 or by an appeal	 or	 by some process of removal of a suit from an inferior tribunal. An appeal is a process of civil law origin and removes a cause	 entirely subjecting the fact as well as the law	 to a review and a retrial '. A writ of error is a process of common law origin	 and it removes nothing for re examination but the law. The former mode is (1)53 I.A. 74. (2) A.I.R. 1937 Mad. (3) 13 C.L.J. 90. (4) ; 327 usually adopted in cases of equity and admiralty jurisdiction; the latter	 in suits at common law tried by a jury. Now when the aid of the High Court is invoked on the revi sional side it is done because it is a superior court and it can interfere for the purpose of rectifying the error of the court below. Section 115 of the Code of Civil Procedure circumscribes the limits of that jurisdiction but the jurisdiction which is being exercised is a part of the general appellate jurisdiction of the High Court as a superior court. It is only one of the modes of exercising power conferred by the Statute; basically and fundamentally it is the appellate jurisdiction of the High Court which is being invoked and exercised in a wider and larger sense. We do not	 therefore	 consider that the principle of merger of orders of inferior Courts in those of superior Courts would be affected or would become inapplicable by making a distinction between a petition for revision and an appeal. It may be useful to refer to certain other decisions which by analogy can be of some assistance in deciding the point before us. In U. J. section Chopra vs State of Bombay(1) the principal of merger was considered with reference to section 439 of the Criminal Procedure Code which confers revisional jurisdiction on the High Court. In the majority judgment it was held	 inter alia	 that a judgment pronounced by the High Court in the exercise of its appellate or revisional jurisdiction after issue of a notice and a full hearing	 in the presence of both the parties would replace the judgment of the lower court thus constituting the judgment of the High Court the only final judgment to be executed in accordance with law by the court below. In Chandi Prasad Chokhani vs The State of Bihar	 (2) it was said that save in exceptional and special circumstances this Court would not exercise its power under article 136 in such a way As to bypass the High Court and ignore the latter '& decision which had become final and binding by entertaining an appeal directly from orders of a Tribunal. Such exercise of ' power would be particularly inadvisable in a case where the result might lead to a conflict of decisions of two courts of competent _jurisdiction. In our opinion the course which was followed by the High Court	 in the present case	 is certainly one which leads to a conflict of 'decisions of the same court. Even on the assumption that the order of the appellate court had not merged in the order of the single Judge who had dis posed of the revision petition we are of the view that a writ petition ought not to have been entertained by the High Court when the respondent bad already chosen the remedy under section 115 of (1) ; (2) ; 328 the Code of Civil Procedure. If there are two modes of invoking the jurisdiction of the High Court and one of those modes has been chosen and exhausted it would not be a proper and sound exercise of discretion to grant relief in the other set of proceedings in respect of the same order of the subordinate court. The refusal to gray relief in such circumstances would be in consonance with the anxiety of the court to prevent abuse of process as also to respect and accord finality to its own decisions. In the result the appeal is allowed and the judgment of the division bench of the High Court is hereby set aside. The appellant shall be entitled to costs in this Court. Y.P. Appeal allowed.

Against the order of an appellate court	 the respondent filed a revision under section 115 of the Code of Civil Procedure. The Single Judge of the High Court dismissed the revision. Thereupon the respondent moved a petition under articles 226 and 227 of the Constitution challenging the same order of the appellate court. The High Court held that in spite of the dismissal of the revision petition	 it could interfere under articles 226 and 227 of the Constitution on a proper case being made out; and after going into the merits of the case	 it granted relief to the respondent. In appeal to this Court	 the appellant contended that the High Court could 	not interfere under articles 226 and 227. Allowing the appeal	 this Court	 HELD : Even on the assumption that the order of the appellate court .had not merged in the order of the Single Judge who had disposed of the revision petition a writ petition ought not to have been entertained by the High Court when the respondent had already chosen the remedy under section 115 of the Code of Civil Procedure. If there are two modes of invoking the jurisdiction of the High Court and one of those modes has been chosen and exhausted it would not be a proper and sound exercise of discretion to grant relief in the other set of proceedings in respect of the same order of the subordinate court. The refusal to grant relief in such circumstances would be in consonance with the anxiety of the court to prevent abuse of process as also to respect and accord finality to its own 'decisions. [327 H] When the aid of the High Court is invoked on the revisional side it is done because it is a superior court and it can interfere for the purpose of rectifying the error of the court below. Section 115 of the Code of Civil 'Procedure circumscribes the limits of that jurisdiction but the jurisdiction which is being exercised is a part of the general appellate jurisdiction of the High Court as a superior court. It is only one of the modes of exercising power conferred by the Statute; basically and fundamentally it is the appellate jurisdiction of the High Court which is being invoked and exercised in a wider and larger sense. The principle of merger of orders of inferior courts in those superior courts would not be affected or would not become inapplicable by making a distinction between a petition for revision and an appeal. [327 B] Madan Lal Rungta vs Secy. to the Government of Orissa	 [1962] 3 Supp. S.C.R. 906	 Nagendra Nath Dey vs Suresh Chandra Dey. 59 I.A. 283	 287; Raja of Ramnad vs Kamid Rowthen & Ors. 53 I.A. 74	 P. P. P. Chidambara Nadar vs C.P.A. Rama Nadar & Ors. A.I.R. 1937 Mad. 385	 Secretary of State for India in Council vs British India Steam Navigation Co. 13 C.L.J. 90	 Attorney General vs Sillem	 ; 	 Chappan vs Moidin	 	 80	 U. J. section Chopra vs State 323 of Bombay; 	 and Chandi Prasad Chokhani vs state of Bihar; 	 	 referred to. K. B. Sipahimalani vs Fidahussein Yallibhoy	 58 B.L.R. 344	 disapproved.