or sentence, unless the Court making the order exceeded its jurisdic-
tion so that the order is a nullity. But the Supreme Court is a
superior Court of record having general jurisdiction. It may not
be true that such a Court has in all cases an authority to determine
its own jurisdiction, which makes it impossible ever to treat its
orders as nullities, but it is in this particular instance true that it
had authority conclusively to determine the existence of its own
jurisdiction, and so, whether it correctly determined it or not, to
make an order which was a valid judicial order, and not a mere
nullity operating to give no authority to hold the prisoner. By
virtue of sec. 39 of the Judiciary Act, the Supreme Court is invested,
not only with all the Federal jurisdiction which the Parliament has
conferred on this Court, but also, subject to immaterial exceptions,
with all the Federal jurisdiction which the Parliament could confer
on this Court ; and that jurisdiction is conferred in addition to, or,
as the case may be, in substitution for, the jurisdiction which the
Court possessed under State law. It was for it to decide the scope
and operation of sec. 68 of the Judiciary Act and the other relevant
enactments, and that decision, in my opinion, resulted in a binding
judicial order, and not in a nullity, an order the validity of which
cannot be challenged in this way. It is not to be expected that
cases exactly like the present would arise under the system in
England, but the conclusion I have expressed appears to me to be
supported by R. v. Lees (1). There the prisoner had been convicted
by the Supreme Court of St. Helena upon an indictment charging an
assault with intent to murder, committed upon the high seas on a
ship not alleged to be a British ship by a prisoner not alleged to be
a British subject. It was sought to obtain an order nisi, upon the
ground that the Supreme Court of St. Helena had no jurisdiction
unless it was a British ship or the offence was committed in respect
of British subjects. But the Court refused to allow a writ of habeas
corpus, or any other prerogative writ, saying : - " A writ of habeas
corpus, to the expediency of granting which we have also directed
our attention, is not grantable in general where the party is in
execution on a criminal charge, after judgment, on an indictment
according to the course of the common law. And, even supposing