The statute establishes the Australian Coastal Shipping Commission as a body corporate with perpetual succession and a common seal; no corporators are expressly mentioned as such but there is a provision that the Commission shall consist of five Commissioners who shall be appointed by the Governor-General. Of these one is to be the Chairman and he is to be appointed for five years, another is to be Vice-Chairman and he is to be appointed for four years and there are to be three Commissioners to be appointed for three years, two years and one year respectively. Once these initial terms have severally expired all the appointments are to be for five years each (ss. 7 and 8). The functions of the Commission are to establish, maintain and operate shipping services for the carriage of passengers or mails or to provide for doing so. The services are limited to inter-State and overseas carriage and carriage to Territories. If the Minister is of opinion that a shipping service of the Commission is necessary to meet the needs of a particular area and that in the public interest it is desirable that it should be provided, he may direct the Commission to establish, maintain and operate a service (s. 17). Subject to this, the Commission is to pursue a policy directed to securing revenue to meet expenditure on revenue account and to allow a reasonable return on capital to the Commonwealth (s. 18). Freight rates, however, are to be subject to the approval of the Minister and so too is the place where the Commission establishes its head office (ss. 19 and 20). The Act contains directions as to a General Manager, employment of staff and accounting and auditing by the Auditor-General and as to reports to the Minister. The power to enact the Australian Coastal Shipping Act 1956, including s. 36 (1) itself, depends upon s. 51 (i) and s. 98 of the Constitution. Section 98 has been construed not as an independent grant of power but as a provision explanatory of the power to legislate with respect to trade and commerce with other countries or among the States: cf. Owners of s.s. Kalibia v. Wilson [1] ; Australian Steamships Ltd. v. Malcolm [2] . In other words, it means that in relation to inter-State and overseas trade, the Parliament may legislate as to navigation and shipping. Section 51 (xxxix) authorizes the Parliament to make laws with respect to matters incidental to the execution of any power vested by the Constitution in the Parliament and this has been treated (somewhat unnecessarily or superfluously, as I think, see Le Mesurier v. Connor [3] ) as including not only what attends, or arises in, the exercise of legislative power but also what is incidental to the subject matter of each of the powers conferred by the other paragraphs of s. 51. The description of the subject matter of those powers is of course brief, but independently of par. (xxxix) the description would be interpreted as including all matters that are incidental thereto. The remaining parts of par. (xxxix) relate to powers vested by the Constitution in the Government of the Commonwealth, or in the Federal Judicature, or in any department or officer of the Commonwealth and do not appear to touch this case. There can, however, be no doubt that the combination of s. 51 (i) with s. 98 gives the widest power to deal with the whole subject matter of navigation and shipping in relation to trade and commerce with other countries and among the States: Morgan v. The Commonwealth [4] ; Australian Steamships Ltd. v. Malcolm [2] . That necessarily includes complete power to establish a government shipping line for the purpose of such trade and commerce. By a government shipping line is meant a corporate agency of the Crown in right of the Commonwealth having for its purpose the carrying on of shipping services under the legislative control of the Parliament for the public advantage and not for private profit and subject only to ministerial directions given in pursuance of the statute. That is what has been done. The fact that a corporation is established to carry on the line makes it no less a function carried on in the interests of the Crown in right of the Commonwealth. The provisions which are set out above set up a corporation as the object of rights and duties and as a legal person in whom the property in the assets is vested. They show that the corporation is established for the purposes of the Crown in right of the Commonwealth. No private interests are involved. Why then should the validity of s. 36 (1) excluding the operation of State tax laws upon the transactions of the body be questioned? The legislative power seems ample not only to enable the Parliament to establish a corporate agency of the Commonwealth to carry on an overseas and inter-State shipping line, but also to protect the Commonwealth Government body from what may be considered the embarrassment of taxation by the various States. It is not material to enquire into the motive of the provision. Its validity depends upon its relevance to, or connexion with, the purpose. Speaking for the Supreme Court of the United States, Stone C.J. said: "Congress has not only the power to create a corporation to facilitate the performance of governmental functions but has the power to protect the operations thus validly authorized. "A power to create implies a power to preserve": McCulloch v. Maryland [1] . This power to preserve necessarily comes within the range of the express power conferred on Congress to make all laws which shall be necessary and proper for carrying into execution all powers vested by the Constitution in the Government of the United States (Const. Art 1 s. 8). In the exercise of this power to protect the lawful activities of its agencies Congress has the dominant authority which necessarily inheres in its action within the national field The exercise of this protective power in relation to state taxation has many illustrations.": Pittman v. Home Owners' Loan Corporation [2] . The case related to State tax levied upon a corporation created by Congress and of that Stone C.J. was speaking. See further Federal Land Bank v. Bismark Lumber Co. [3] . An analogy is to be found in the cases where the United States employs contractors for its government purposes. The question has repeatedly arisen whether an immunity claimed from State taxes exists. Of this a majority of the Supreme Court speaking through Black J. has said recently: "Today the United States does business with a vast number of private parties. In this Court the trend has been to reject immunizing these private parties from nondiscriminatory state taxes as a matter of constitutional law. Cf. Penn Dairies v. Milk Control Commission [4] . Of course this is not to say that Congress, acting within the proper scope of its power, cannot confer immunity by statute where it does not exist constitutionally. Wise and flexible adjustment of intergovernmental tax immunity calls for political and economic considerations of the greatest difficulty and delicacy. Such complex problems are ones which Congress is best qualified to resolve. As the Government points out Congress has already extensively legislated in this area by permitting States to tax what would have otherwise been immune." The doctrine propounded in the foregoing passages applies to federalism in Australia. Given the power in reference to a subject matter of legislation to set up a federal governmental corporation, the power of the Parliament extends to excluding the imposition of State taxes on its operations and the exclusion of liability on the part of the corporation to State taxes upon its activities. The fact that a government agency is set up at all brings under consideration the question whether its operations should or should not be exposed to State taxes. How that question should be decided is a matter of policy. But the legislative power under which, ex hypothesi, the agency is validly set up must surely be enough to enable the legislature to decide it. The various taxes of the six States the liability for which might otherwise be incurred in the course of the activities of what is called the National Shipping Line may have been considered something to which it is desirable that the Commonwealth Line should not be exposed. Once that view is taken it appears to be sufficiently clear that the legislative power must extend to excluding the imposition upon the activities of the Commonwealth Line of such taxation. It is clearly relevant to, and falls within, the subject matter of the power conferred by s. 51 (i) and s. 98. The form of the provision is to exclude State taxation by express words. The argument that under a legislative power of the Commonwealth the operation of State laws cannot be directly and expressly excluded has been used without effect in a succession of cases beginning with The Commonwealth v. Queensland [1] . It may be worth remarking that the interpretation, long since adopted by this Court, of s. 109 is hardly consistent in thought with such an argument. The Court has interpreted s. 109 as operating to exclude State law not only when there is a more direct collision between federal and State law but also when there is found in federal law the manifestation of an intention on the part of the federal Parliament to "occupy the field": see Hume v. Palmer [2] ; Ex parte Nelson [No. 2] [3] ; Ex parte McLean [4] . Surely, consistency with that doctrine demands that a legislative power, such as that given by s. 51 (i) together with s. 98, must extend to a direct enactment which expressly excludes the operation of State law provided the enactment is within the subject matter of the federal power. Indeed there can really be no other way of expressing the intention and accomplishing the federal legislative purpose. Section 36 (1) is a law with respect to trade and commerce with other countries and among the States and it seems to me to be within power and therefore valid.