Tn Bagot v. Commissioner for Railways (1), the Supreme Court
reconsidered the case of Wilson v. W. Winn & Co. Ltd. (2) and
announced that it should no longer be regarded as an authority upon
the question here involved. And in Ex parte Ferguson; Re Alea-
ander (3), the Supreme Court considered the matter more at large.
It was recognized, I think, that the solution of the question depends
upon the construction of the legislative provision in every case. No
doubt the proper construction of the provision depends not only
upon its form, but upon its substance and nature. But in Ex parte
Ferguson (4) it was said that, "if, in the statement of the conditions
in which a person is invested with a civil right, a condition for the
absence of fault or fraud on his part is included, this is not in general
regarded as a factor which must be established as a necessary ingre-
dient of the right, so as to throw the burden of proof in this respect
on him." This proposition is based, I think, upon the case of
Metropolitan Coal Co. Ltd. v. Pye (5), which turns upon the con-
struction of the particular statute there in question, and Joseph
Constantine Steamship Line Ltd. v. Imperial Smelting Corporation
Ltd. (6), where the question was, to adopt the statement of Lord
Russell of Killowen, whether the doctrine of frustration in the law
of contract was " frustration will excuse unless proved to be self-
induced . . . or whether frustration will not excuse unless it is
proved not to be self-induced " (7). But, in the present case, we are
uot in search of the true principle or doctrine, for the statute itself has
prescribed the rule and the function of the Court is to construe it.
Still it is said that the proving of a negative is an exceptional burden