The enumeration of matters in respect of which the Irish Parliament shall have no power to make laws is a little deceptive, inasmuch as many of the matters so enumerated would have been outside its power in any case. Ireland is not, so long as the Act of Union remains on the Statute Book, a sovereign state, and “the making of peace or war” and the negotiation of treaties would, as a matter of international law, have been impossible in her case, even if they had not been expressly prohibited. “Merchant shipping” and “the return of fugitive offenders” would also have been excluded from her authority by the rule of law(43) which precludes a subordinate legislature from extra-territorial legislation. The same may be said of Copyright. The colonies have only been enabled to deal with these matters in virtue of clauses in Acts of the Imperial Parliament.(44) But it would not be true to say that the position of the Irish Parliament is assimilated to that of the legislature of a self-governing colony. The exclusion of subjects relating to allegiance, such as naturalization(45) and treason,(46) and of legislation as to aliens is exceptional. All the self-governing colonies have power to deal with these matters, as also with the subject of naval and military forces. Perhaps the most important exemption in the case of Ireland is that of trade, trade-marks, designs, merchandise marks and patent rights. I cannot help regretting that, inasmuch as the principle has been adopted of giving Ireland general and unenumerated powers, the number of specific exemptions has not been enlarged. It is highly desirable to avoid conflict of laws in the United Kingdom as far as possible. It must be remembered that the Statute Book has, quite apart from the Act of Union, bound Ireland to England by many legislative ties; there is a uniform system of industrial, commercial, and, to some extent, criminal law for the whole of these Islands—Factory Acts, Companies Acts, the law of negotiable instruments, criminal procedure, old-age pensions, and insurance legislation; in all these there is legislative standardization, and the tendency of all modern political unions, notably those of the Australian Commonwealth and the German Empire, is in this direction. Confusion, injustice, and economic inequalities constantly occur in a modern State whose inhabitants are living under a “conflict of laws.” Fiscal considerations point the same way. It may be safely assumed that English opinion will not tolerate any considerable divergence between the fiscal systems of England and Ireland. Moreover, financial considerations apart, the regulation of “trade” is, as in every political union, reserved for the central legislature. But to distinguish between “trade” on the one hand and “industry” on the other is not an easy problem, and Ireland may discriminate against England only less effectively by lowering the standard of the Factory Acts than by a tariff.