It was not argued in the present case that the Commonwealth Parliament has any power to legislate for the acquisition of property except under s. 51 (xxxi.). Legislation under the provision must, in order to be valid, be legislation which provides for just terms. If par. xxxi. had not appeared in s. 51, there is little doubt that other paragraphs of s. 51 would have been interpreted so as to authorize the Parliament to make laws for the acquisition of property in relation to the subject matters of those paragraphs. For example, under the power to legislate with respect to lighthouses and bankruptcy, there is no doubt that the Parliament would have been entitled to legislate for the purpose of acquiring land for the erection of lighthouses and bankruptcy courts. The paragraphs of s. 51 should not, in my opinion, in general be read as limiting each other in any way. But there are special characteristics of par. xxxi. which raise special questions with respect to the power to legislate for the acquisition of property. Par. xxxi. gives express power to legislate for the acquisition of property "for any purpose in respect of which the Parliament has power to make laws." This phrase is used in a general descriptive sense and, in its setting, may fairly be interpreted as referring to all other matters with respect to which the Parliament has power to make laws and, therefore, as including the thirty-eight subjects referred to in the other paragraphs of s. 51, as well as other subjects mentioned in other sections of the Constitution. Thus the phrase, "purpose in respect of which the Parliament has power to make laws," incorporates by reference all the other subject matters of the legislative power of the Commonwealth. (Perhaps the power to make laws for the government of territories (Constitution, s. 122) should be excepted from this statement (cf. R. v. Bernasconi[1]), but it is not now necessary to express an opinion upon that question.) In relation, for example, to defence, par. xxxi. means that the Parliament may legislate for the acquisition of property on just terms for the purpose of the naval and military defence of the Commonwealth and of the several States and the control of the forces to execute and maintain the laws of the Commonwealth. When par. xxxi. is thus construed in relation to a particular purpose it must, I think, be regarded as limiting the legislative power with respect to the acquisition of property for that purpose. In other words, the terms of par. xxxi. are such that, for example, the power to legislate with respect to defence cannot be interpreted as including a power to make laws for the acquisition of property upon any terms which commend themselves to Parliament, whether they are just or not. In relation to defence, as in relation to all other legislative purposes, an express and specific power to make laws is given by par. xxxi. and that power is limited by the inclusion of the words "on just terms." Accordingly, I am of opinion that the only power of the Commonwealth Parliament to legislate with respect to the acquisition of property for defence purposes is that conferred by s. 51 (xxxi.).