The legislative powers of the Parliament are not plenary, but are
restricted to those conferred upon it by the Constitution and are
subject to any limitations or conditions imposed by the Constitution.
It cannot free itself from such limitations or conditions ; only the
process provided for by sec. 128 of the Constitution (or, in theory,
the Imperial Legislature) can do that; nor can it decide for itself
whether a purported exercise of a power is valid ; and if an exercise
of a power involves any legal consequences prescribed by the Con-
stitution it cannot exempt itself from any of those consequences.
The questions whether an Act of the Federal Parliament is valid,
and if so whether it involves any and what legal consequences,
can be determined only by an exercise of the judicial power, either
by this Court, by some other Federal court which the Federal Parlia-
ment has created, or by some other court which it has invested
with Federal jurisdiction in that behalf, or by some court when the
question arises in proceedings before it and is not removed into this
Court under secs. 40 and 40a of the Judiciary Act 1903-1940. But
no body but a court can be invested with such jurisdiction. The
power now in question provides that: "The" (Federal) " Parliament
shall, subject to this Constitution, have power to make laws for the
peace, order, and good government of the Commonwealth with
respect to: - . . . The acquisition of property on just terms " -
not, it is to be observed, on such terms as to it seem just - * from any
State or person for any purpose in respect of which the Parliament has
power to make laws " (sec. 51, placitum xxxi. of the Constitution).
But "any ' property' specified in the statute may be taken provided
'just térms' are available by law" (per Isaacs J. in The Common-
wealth v. New South Wales (1) ). This limitation or restriction is an
" affirmance of a great doctrine established by the common law for
the protection of private property " (Story on the Constitution, 3rd ed.
(1858), vol. 1., p. 596, par. 1790) and is in accordance with Magna
Carta, which 'protected every individual of the nation in the free
enjoyment of his life, his liberty, and his property, unless declared to
be forfeited by the judgment of his peers or the law of the land"
(Blackstone, 4th ed., vol. tv.,p. 417). Sec. 5 (1) of the National Security
Act 1939-1940 provides that the Governor-General may make regula-
tions (b) for authorizing (ii) the acquisition on behalf of the Common-
wealth of any property other than land. In purported exercise of
this Act the National Security (Apple and Pear Acquisition) Regula-
tions were made. These provide by reg. 12 that the Minister for
Commerce may make provision by an order published in the Gazette
for the acquisition by the Commonwealth of any apples and pears
(1) (1928) 38 C.L.R., at p. 47.