is contrary, as I think, to settled principles of construction. Cases
of ambiguity I leave on one side, for there is no ambiguity in the meaning of the present regulations.
It is desirable, however, to consider the law, practice or rule of nations upon which reliance is placed. Hall, Treatise on Inter- national Law, 7th ed. (1917), S. 61, p. 219, states that it is in accord- ance with general principle to say, as is in effect said by M. Bluntschli, that:
1. It is not permissible to enrol aliens, except with their own consent, in a force to be used for ordinary national or political objects.
2. Aliens may be compelled to help to maintain social order, provided that the action required of them does not overstep the limits of police, as distinguished from political action.
3. They may be compelled to defend the country against an external enemy when the existence of social order or of the popula- tion itself is threatened, when, in other words, a state or part of it is threatened by an invasion of savages or uncivilized nations."
During the Civil War in America, the British Government, how- ever, instructed its ambassador that there was no rule or principle of international law which prohibits the government of any country from requiring aliens resident within its territories to serve in the militia or police of the country or to contribute to the support of such establishments (Hall, Treatise on International Law, 7th ed. (1917), at p. 218). The practice or rule of civilized nations is thus rather vague and undefined. And to limit constitutional powers by the rule suggested would be subversive of the sovereignty of the State itself. And to construe the legislation of sovereign States or their subordinate legislative authorities by reference to such a rule would often be in direct contradiction of the legislation itself and in any case beyond the ordinary functions of courts of law. The truth is that the so-called law is a practice or rule which every State enjoys as of right for the protection of its subjects abroad (See Oppenheim, International Law, 4th ed. (1928), vol. 1, Peace. S. 320, p. 558) and it is a right which is exercised through diplomatic action. To treat the rule as a restriction upon the legislative capacity of sovereign States or as an overriding principle governing the construction of legislative acts ignores the fundamental principle of government that a State is sovereign within its territory and it is moreover, SO vague and indefinite that courts of law would find it difficult, if not impossible, of application. But this is not to say that the plaintiffs have no remedy they may represent their cases to the Commonwealth, which would not, I should think, send them