I have endeavoured to show how widely sec. 51, sub-sec. v1.,
extends in its ambit, but it is very difficult, even if it is possible, to
express its ambit, as it exists in this time of war, by any proposition
intended to define it. Many matters may, not because of enthusiasm,
'or excitement, but by compelling reason, be seen to come within it
at a critical time, which at a time less critical were not realized as
embraced in its scope as aids to defence. It may be only in a
great emergency that it is demonstrated that they must be utilized
to render defence successful. For instance, a great battle is fought
'on our land, or in our waters, or thousands of miles away. Suppose
the result to be indecisive or even adverse. Subjects which before
that battle seemed only indirectly or remotely connected with
defence as the means of winning the war may after the battle be
seen quite clearly to be within it. It may be, as Sir William Irvine
urged, that the power does not change. If that is so it is because
of the perspective of affairs: because the power looks narrower
in peace, when it is not in the foreground of our view than
it does as a means of present war when war brings us into close
contact with it - when its exercise becomes the most vital of our
activities. It may be that the power does not become enlarged in
war, but that when seen closely we know how large it is in relation
to existing war. Then at least we are able to envisage the reach
of its long arm. If the thing be capable, during war, of aiding
our arms by land or sea, here or elsewhere, we are to say so, but
'we say no more. It may be wholly beside the mark in peace, and,
if it be so, we are to say so upon due occasion. But the necessity
is not for us, when facts of which we take judicial notice establish
that the thmg is capable of aiding directly the execution of the
power. If it is thus capable, then the question of the necessity, or
the wisdom or expediency, of invoking such aid, is for Parliament
or its duly delegated authority.