received by the Government of Western Australia or by the Treasury
or Treasury Department on its behalf for the use of the suppliant,
is such as to found a petition of right at common law. For the
reasons already given this question should be answered, as it was in
the Supreme Court, in the affirmative. But let it be assumed that
the exclusive method of pursuing claims and demands against the
Crown in Western Australia founded upon or arising out of some
breach of contract is that prescribed by the Crown Suits Act, still,
in my opinion, the present petition stands outside those provisions.
As between subject and subject the petitioner's cause of action might
have been framed in contract or in tort (Morison v. London County
and Westminster Bank Ltd. (1) ). But the matter was one of substance,
not of form. And "the substance is the right of the plaintiff to
recover property or its proceeds from one who has wrongfully
received them": See United Australia Ltd. v. Barclay's Bank Ltd.
(2). Thus Lord Wright, reviewing this case, has said (Law Quarterly
Review, vol. 57, p. 198): "The abolition of the Forms of Action
has made it clear that besides the categories of contract and tort,
there is a further distinct category, which has been variously named
quasi-contract, restitution, unjust enrichment . . . Professor -
Winfield (Province of Tort, p. 119) had suggested the following
definition: 'So far as current English law is concerned, genuine
quasi-contract signifies liability, not exclusively referable to any other
head of the law, imposed upon a particular person to pay money
to another particular person on the ground of unjust benefit '" :
See also Holdsworth, History of English Law, (1926), vol. 9, p. 42.
And in my opinion such a claim can be asserted against the Crown
for reasons so strongly asserted by Scrutton L.J. in Brocklebank Ltd.
v. The King (3). In truth such a proceeding is to recover property
or money of the petitioner which has found its way into the hands
of the Crown and is wrongfully detained. Further I would add
that the decision in Brocklebank Ltd. v. The King (4) suggests that
the claim or demand within s. 33, par. 1, must arise under a
definite contract, whether expressed or implied, and not a contract
assumed in law upon a liability arising upon quasi-contracts as for
money had and received.