This provision purports to deal only with the actual jurisdiction of the High Court.
The original jurisdiction of the High Court is to be ascertained by considering, first, S. 75 of the Constitution, which directly confers original jurisdiction in five classes of matters upon the High Court, secondly. S. 76, which authorizes Parliament to make laws conferring original jurisdiction on the High Court in four classes of matters, and thirdly, any legislation passed under the power conferred by S. 76. This power has been exercised in the Judiciary Act, S. 30, which provides that, in addition to the matters in which original jurisdiction is conferred on the High Court by the Constitution (that is, by S. 75 of the Constitution), the High Court shall have original jurisdiction in two matters therein specified. Other statutes, e.g. patents, trade marks, copyright, and taxation statutes, also confer original juris- diction upon the High Court.
The words of S. 39 (1), " the jurisdiction of the High Court ", in their natural sense refer to the jurisdiction which the High Court actually has, that is, its actual jurisdiction, as distinct from what might be called its potential jurisdiction, that is, jurisdiction which might be conferred upon it, but which has not in fact been conferred upon it. The effect of S. 39 (1), therefore, is to make the actual jurisdiction of the High Court completely exclusive of the jurisdiction of any court of a State except as provided in S. 39. The exclusion of the State courts effected by SS. 38 and 38A is complete. In other matters, the exclusion is an exclusion subject to the exceptions pro- vided in S. 39.
Section 39 (2) proceeds to exercise the power conferred upon the Parliament by S. 77 (iii.). (It is unnecessary for the purposes of this case to refer to pars. (b), (c) and (d) of the section.) Section 39 (2) (a) is in the following terms :-
" The several Courts of the States shall within the limits of their several jurisdictions, whether such limits are as to locality, subject-matter, or otherwise, be invested with federal jurisdic- tion, in all matters in which the High Court has original juris- diction or in which original jurisdiction can be conferred upon it, except as provided in the last two preceding sections, and subject to the following conditions and restrictions :-
(a) Every decision of the Supreme Court of a State, or any
other Court of a State from which at the establishment of the Commonwealth an appeal lay to the Queen in Council, shall be final and conclusive except SO far as an appeal may be brought to the High Court."