By its statement of claim, to which the defendants have demurred, the plaintiff attacks the validity of the Wool Tax Act (No. 1) 1964, the Wool Tax (Administration) Act 1964 and the Wool Industry Act 1962-1964. The Wool Tax Act (No. 1) imposes a tax, being a percentage of the sale price of the wool, on all shorn wool produced in Australia and sold by a wool broker. There are similar taxing Acts imposing tax upon the sale value of shorn wool purchased by a wool dealer from a person other than a wool broker (the Wool Tax Act (No. 2)); upon the sale value of shorn wool purchased by a manufacturer from a person other than a wool broker or wool dealer (the Wool Tax Act (No. 3)); upon the sale value of shorn wool subjected by a manufacturer to a process of manufacture (the Wool Tax Act (No. 4)); and upon the sale value of shorn wool produced in and exported from Australia (the Wool Tax Act (No. 5)). In each Act provision is made to ensure that the tax is not imposed more than once in respect of the same wool. The Wool Tax (Administration) Act provides the machinery for the payment and collection of the tax imposed by each of the Tax Acts. It is administered by the Commissioner of Taxation and all moneys collected under it are, by s. 81 of the Constitution, required to be paid into the Consolidated Revenue Fund. It defines the persons liable to pay the tax (s. 11) and, by s. 12, requires the wool broker, wool dealer, manufacturer or exporter, as the case may be, to pay the tax with the right to recover the amount so paid from the person liable, under s. 11, to pay the tax. Under Pt II of the Wool Industry Act the Australian Wool Board is established. Its functions are to promote the use of wool and wool products in Australia and other countries; to inquire into and report upon methods of marketing wool and any other matters connected with the marketing of wool; and to perform such other functions as are conferred upon it by the Act or being functions conducive to the achievement of an object of the Act are approved by the Minister (s. 24 (1)). For these purposes it is empowered (inter alia) to use such means as it thinks fit for the purpose of promoting the use of wool and wool products including (i) the use of publicity; (ii) the encouraging of research in connexion with the production or use of wool; and (iii) the encouraging of the improvement of production of wool in Australia (s. 24 (2)). Section 5 (1) declares that the objects of the Act are (a) To promote the export from Australia of wool and wool products; (b) To promote trade and commerce in wool and wool products among the States, between States and Territories and within the Territories; (c) To encourage the production and the use of wool in the Territories; and (d) To ensure the availability in time of war or when danger of war exists of wool stores for use for purposes of defence. So far as the Territories are concerned, pars. (b) and (c) are no doubt based upon s. 122 of the Constitution while par. (d) is based upon the defence power. Section 5 (2) provides that the Board, the Authority (which means the Australian Wool Testing Authority established under Pt III of the Act and with the powers and functions described in that Part) and any committee established under the Act shall not perform its functions or exercise its powers except for the purpose of achieving an object specified in s. 5 (1). The Board's functions, as set out in s. 24 (1), are therefore to be exercised subject to the limitations imposed by s. 5. Provision is made for financing the Board's operations by ss. 32 and 32A. Section 32 directs the payment to the Board out of the Consolidated Revenue Fund, which is appropriated accordingly, of amounts equal to the amounts received by the Commissioner of Taxation in respect of tax imposed by the various Wool Tax Acts less certain deductions, and s. 32A appropriates out of the Consolidated Revenue Fund certain other moneys which are to be paid to the Board.