Leverrier K.C. (with him Flannery), for the Commonwealth
intervening. Cheques on the Commonwealth Bank are not liable
to State stamp duty on two grounds, first, because it is a tax
upon the operation of a Commonwealth instrumentality, and,
secondly, because the Commonwealth Bank Act being a law of
the Commonwealth, the Queensland Stamp Act 1894, so far as it
purports to tax such cheques, is inconsistent with the former Act
and is to that extent invalid. The Commonwealth must incur
debts in various parts of the Commonwealth, and in order to pay
those debts it is necessary and proper that the Commonwealth
should establish branches of the Treasury in different places, and
it might authorize those branches to borrow money in order to
pay those debts. The Commonwealth could, instead of establishing
branches of the Treasury, establish extra-departmental agencies
for the same purpose, and give them the same powers. If the
Commonwealth Government provided certain forms to be filled
in by lenders of money to the branches or agencies before re-
payment of their loans, it is clear that those forms would be
Commonwealth instrumentalities, and would not be liable to
State taxation. The form would be an instrumentality ; and so
would the transaction itself, and the giving and taking the form
would be an operation of a Commonwealth instrumentality. The
Commonwealth Bank is an agency of that kind in all its functions.
The creation of the Bank is authorized by sec. 51 (xxx1x.) of the
Constitution, being incidental to the finance powers of the Govern-
ment. The power of the Bank to borrow money on current
account is also an incidental power. The mention of State bank-
ing in see. 51 (Xu.) shows that it was recognized that banks of
this kind were for governmental purposes. The power of the
Bank to borrow on current account is a function of great import-
ance, and is appropriate for the purposes of government. In
order that the Bank may borrow money on current account it
must be ready to accept all money that is offered, so that the
fact that more money is so borrowed than is necessary for