At the time of the adoption of the Constitution the vast Valley of the Mississippi, now teeming with population and supplying almost boundless resources, was literally an unexplored wilderness. Our advancement has outstripped even the most sanguine anticipations of the fathers of the Republic, and it illustrates the fact that no rule is admissible which undertakes to discriminate, so far as regards river and harbor improvements, between the Atlantic or Pacific coasts and the great lakes and rivers of the interior regions of North America. Indeed, it is quite erroneous to suppose that any such discrimination has ever existed in the practice of the Government. To the contrary of which is the significant fact, before stated, that when, after abstaining from all such appropriations for more than thirty years, Congress entered upon the policy of improving the navigation of rivers and harbors, it commenced with the rivers Mississippi and Ohio. The Congress of the Union, adopting in this respect one of the ideas of that of the Confederation, has taken heed to declare from time to time, as occasion required, either in acts for disposing of the public lands in the Territories or in acts for admitting new States, that all navigable rivers within the same "shall be deemed to be and remain public highways." Out of this condition of things arose a question which at successive periods of our public annals has occupied the attention of the best minds in the Union. This question is, What waters are public navigable waters, so as not to be of State character and jurisdiction, but of Federal jurisdiction and character, in the intent of the Constitution and of Congress? A proximate, but imperfect, answer to this important question is furnished by the acts of Congress and the decisions of the Supreme Court of the United States defining the constitutional limits of the maritime jurisdiction of the General Government. That jurisdiction is entirely independent of the revenue power. It is not derived from that, nor is it measured thereby.