This reflection may serve to relieve from undeserved reproach an idea of one of the greatest men of the Republic--President Jackson. He, seeking amid all the difficulties of the subject for some practical rule of action in regard to appropriations for the improvement of rivers and harbors, prescribed for his own official conduct the rule of confining such appropriations to "places below the ports of entry or delivery established by law." He saw clearly, as the authors of the above-mentioned acts of 1789 and 1845 did, that there is no inflexible natural line of discrimination between what is national and what local by means of which to determine absolutely and unerringly at what point on a river the jurisdiction of the United States shall end. He perceived, and of course admitted, that the Constitution, while conferring on the General Government some power of action to render navigation safe and easy, had of necessity left to Congress much of discretion in this matter. He confided in the patriotism of Congress to exercise that discretion wisely, not permitting himself to suppose it possible that a port of entry or delivery would ever be established by law for the express and only purpose of evading the Constitution. It remains, therefore, to consider the question of the measure of discretion in the exercise by Congress of the power to provide for the improvement of rivers and harbors, and also that of the legitimate responsibility of the Executive in the same relation. In matters of legislation of the most unquestionable constitutionality it is always material to consider what amount of public money shall be appropriated for any particular object. The same consideration applies with augmented force to a class of appropriations which are in their nature peculiarly prone to run to excess, and which, being made in the exercise of incidental powers, have intrinsic tendency to overstep the bounds of constitutionality. If an appropriation for improving the navigability of a river or deepening or protecting a harbor have reference to military or naval purposes, then its rightfulness, whether in amount or in the objects to which it is applied, depends, manifestly, on the military or naval exigency; and the subject-matter affords its own measure of legislative discretion. But if the appropriation for such an object have no distinct relation to the military or naval wants of the country, and is wholly, or even mainly, intended to promote the revenue from commerce, then the very vagueness of the proposed purpose of the expenditure constitutes a perpetual admonition of reserve and caution. Through disregard of this it is undeniable that in many cases appropriations of this nature have been made unwisely, without accomplishing beneficial results commensurate with the cost, and sometimes for evil rather than good, independently of their dubious relation to the Constitution.