the Queensland Stamp Act in question, which imposes*a duty of
one penny on every bill of exchange payable on demand (includ- ing cheques on bankers), if enforced against a customer of the Commonwealth Bank of Australia, would fetter, control or interfere with the free exercise of the legislative or executive power of the Commonwealth by fettering, controlling or interfer- ing with an instrumentality of the Commonwealth, namely, the Commonwealth Bank of Australia.
The first question to decide is whether the Commonwealth Bank of Australia has, by the Act by which it is established (No. 18 of 1911), been made an instrumentality of the Govern- ment to carry out functions of government only or to carry out,
SO far as current accounts of ordinary customers are concerned, apart from the savings bank business, the ordinary business of a trading bank.
The Bank is, in my opinion, constituted by the Act a Common- wealth instrumentality to carry out savings bank business-a governmental function in Australia-and possibly other govern- ment business, but under sec. 7 (c) of the Act the power to receive deposits on current account in its trading banking business is only given to it as a trading bank, and not to carry out any governmental functions.
Several other important questions have been raised during the argument, but I do not think it necessary to express any opinion about them on this appeal.
It was not seriously contended that the Constitution gave the Commonwealth special power to establish an ordinary trading bank for profit, that is, a bank apart from one to carry out govern- ment functions, or that pl. XXXIX. of sec. 51 of the Constitution included any power to establish a bank except as one incidental to the execution of any power vested by the Constitution in the Parliament or in either House thereof, or in the Government of the Commonwealth, or in the federal judicature, or in any department or office of the Commonwealth.
Personally, I agree with the learned Chief Justice where he says (1) that "It may be conceded that the Commonwealth Parlia- ment may for the more covenient exercise of any of the executive