“17. Section 3(2) of the Act which makes the provisions of the principal Act mutatis mutandis applicable to the levy of additional tax is a part of the charging provision of the Act and it does not say that only those provisions of the principal Act which relate to assessment and collection of tax will be applicable to the proceedings under the Act. Before considering what provisions of the principal Act should be read as part of the Act, we have to understand the meaning of the expression ‘mutatis mutandis’. Earl Jowitt's The Dictionary of English Law (1959) defines ‘mutatis mutandis’ as ‘with the necessary changes in points of detail’. Black's Law Dictionary (Revised 4th Edn., 1968) defines ‘mutatis mutandis’ as “with the necessary changes in points of detail, meaning that matters or things are generally the same, but to be altered when necessary, as to names, offices, and the like. Housman v. Waterhouse [191 App Div850 : 182 NYS 249, 251] . In Bouvier's Law Dictionary (3rd Revision, Vol. II), the expression ‘mutatis mutandis’ is defined as “[T]he necessary changes. This is a phrase of frequent practical occurrence, meaning that matters or things are generally the same, but to be altered when necessary, as to names, offices, and the like”. Extension of an earlier Act ‘mutatis mutandis’ to a later Act brings in the idea of adaptation, but so far only as it is necessary for the purpose, making a change without altering the essential nature of the thing changed, subject of course to express provisions made in the later Act. Section 3(2) of the Act shows that the State legislature intended not to depart substantially from the principal Act except with regard to matters in respect of which express provision had been made in the Act. The assumption made by the High Court that the Act was an independent Act having nothing to do with the principal Act is not correct. The Act only levied some extra sales tax in addition to what had been levied by the principal Act. The nature of the taxes levied under the Act and under the principal Act was the same and the legislature expressly made the provisions of the
