The Judgment of the Court was delivered by SHAH, J. This appeal is filed with certificate granted by the High Court of Patna urider Art. 133( 1) (a) of the Constitution. The appellant Hansraj Bagrecha carries on business in jute. In the course of his business the appellant buys raw jute from proB ducers in West Bengal, transports it to Kishanganj Railway Station (which is within the State of Bihar) and then re-exports it to purchasers in West Bengal. He also buys raw jute in Bihar and exports it to the merchants or mill owners in West Bengal by rail from Kishanganj Railway Station. The Bihar Sales Tax Act, 1959, as originally enacted did not c ,provide for levy of purchase tax. By the Bihar F'inance Act, · 1966, with effect from April l, 1967, among others the following · sections were incorporated in the Bihar Sales Tax Act, 1959 : S. 3 A "'The State Government may from time to time, by notification declare any goods to be liable to D purchase tax on turnover. of purchase : Provided that general sales tax and special sales ta.X shall not be payable on the sale of goods or class of goods declared under. this section." S. SA· "The purchase tax on goods declared under section 3A shall be levied at the point of purchase made E from a person other than a registered ,dealer." .By a notification dated September 14, 1966 the Governor ofBihar declared 'jute' as a commodity liable to purchase tax at the rate specified in the notification. Section 42 of the Bihar Sales Tax Act by the first sub-section F provided: "No person shall transport from any railway station, steamer station, air-port, post office or any other placi:, ·whether of similar nature. or otherwise, notified in this behalf by the State Govt., any consig1m1ent of such goods, exceeding such quantity, as may be specified in G the notification, except in accordance with such conditions as may be prescribed and such conditions shall be made with a view to ensuring that there is no evasion of tax payable under this Act." Section 46 of the Act invested the State Government with power II to-make rules for all matters expressly required or allowed by the Act to be prescn"bed and generally for carrying out the purposes of the Act and regulating the procedure to be followed, forms to