This principle, however, will not apply in the following cases: (a) where the subsequent Act and the previous Act are supplemental to each other; (b) where the two Acts are in pari materia; (c) where the amendment in the previous Act, if not imported into the subsequent Act also, would render the subsequent Act wholly unworkable and ineffectual; and (d) where the amendment of the previous Act, either expressly or by necessary intendment, applies the said provisions to the subsequent Act." Applying the above principles to the facts of the present case, the High Court in its judgment on a reference made to it under the 1963 Act (and reported in 4 1 S.T.C. 1) observed: "In the light of the principles thus formulated, it seems unnecessary for us to labour the point whether we are confronted in these cases with a "reference" or "citation" on the one hand, or an "incorporation" on the other, of the definition of `cotton fabrics ' in item 19 of the Schedule 1 of the Central Excise and Salt Act, into the provisions of Section 9 read with item No. 7 of the III Schedule of the General Sales Tax Act, 1963.