The principal argument proffered against an affirmative answer is that it would empower the Crown in right of the Commonwealth - in effect, the Executive Government of the day - by entering into an international agreement on any subject to acquire for the Commonwealth Parliament a legislative power with respect to that subject, although the Constitution had not conferred that power upon the Parliament. It is argued that legislative powers so deliberately distributed by the Constitution might be redistributed by executive action and the powers of the States eroded by the making of treaties. (By treaty I mean to include all agreements made by Australia with other international persons so as to be binding upon Australia and one or more other international persons.) Yet there is no doubt that par. (xxix) is an independent and plenary head of power which will support legislation for the performance of treaty obligations, at least in some instances. In New South Wales v The Commonwealth [19] , Barwick C.J., speaking of the regulations considered in R. v Burgess; Ex parte Henry [20] , said: " it is clear from the reasons for judgment that if the regulations had been apt to carry out the convention, the fact that they operated upon matters which otherwise did not fall within the power of the Parliament would not have invalidated them. Being laws validly made under the plenary power given by s. 51(xxix), they would not have needed any other power to support them." Whether the content of par. (xxix) be large or small, the external affairs power is an addition to the other powers conferred upon the federal Parliament. The subjects upon which the Parliament may legislate are necessarily enlarged by any enlargement of what is truly comprehended in "external affairs", and it is irrelevant that such an additional subject-matter is not also within another head of power. Whatever construction be placed on par. (xxix), it is clearly a growth point of federal power, for its content grows with the growth in Australia's external affairs. The connotation of external affairs is constant, but it denotes a widening range of subjects. When the Australian federation came into being, the Commonwealth's external relations were almost wholly with England. Australia established its High Commission in London in 1910. But the years since 1940, when Australia first established other diplomatic posts overseas, have seen not only a widening of Australia's relationships with the members of the international community but an increase in the subjects of international co-operation, agreement and concern, an increase that would not have been generally anticipated in 1901.