Seventh Schedule the Union has the power to impose duties ot' excise on tobacco and other goods manufactured or· produced in India except (i) alcoholic liquors for human consumption and (ii) opium, Indian hemp and other narcotic drugs and narcotics, but including medicinal and toilet preparations containing alcohol or any substance like opium etc. Thus the Constitution took away the power of the States . to impose duties of excise on medicinal and toilet preparations containing alcohol or any substance like opium etc. and give that. power to the Union. However, Art. 277 of the Constitution provided that "any taxes, duties, ceases or fees which, immediately before the commencement of this Constitution were being lawf'Qlly levied by the Government of any State or by any municipality or other local authority or body for the purposes of the State, municipality, district or other loc(tl area may, notwithstanding tha.t those taxes, duties, ceases or fees are mentioned in the UQ.ion List, continue to be levied and . to be applied to the same purposes until provision to the contrary is made by Parliament by law". In view of this Article, the State Governments continued to levy excise duties on medicinal and toilet preparations containing alcohol, opium,, etc., till 1957 as Parliament bad made no law to the contrary till then. In 1955, however Parli.ament passed the Medi-. cinal aµd Toilet Preparations (Excise Duties) Act, No. 16 of 1955, hereinafter referred to as the Act) which was brought into force from April 1, f957. We are in the present case concerned only with medicinal preparations anP, a -"medicinal preparation" is defined in s. 2(g) of the Act as. including "all drugs which are a remedy OJ'. prescription prepared for internal or external use of human beings or animals and all substances intended to be used for or in the treatment, mitigation or prevention of· disease in human being or animals." Section 3 provides for levy of duties of excise at the rates specified in the Schedule, on all dutiable goods