The principle here affirmed is that the "degree of its necessity," involving all the details of a banking institution, is a question exclusively for legislative consideration. A bank is constitutional, but it is the province of the Legislature to determine whether this or that particular power, privilege, or exemption is "necessary and proper" to enable the bank to discharge its duties to the Government, and from their decision there is no appeal to the courts of justice. Under the decision of the Supreme Court, therefore, it is the exclusive province of Congress and the President to decide whether the particular features of this act are _necessary_ and _proper_ in order to enable the bank to perform conveniently and efficiently the public duties assigned to it as a fiscal agent, and therefore constitutional, or _unnecessary_ and _improper_, and therefore unconstitutional. Without commenting on the general principle affirmed by the Supreme Court, let us examine the details of this act in accordance with the rule of legislative action which they have laid down. It will be found that many of the powers and privileges conferred on it can not be supposed necessary for the purpose for which it is proposed to be created, and are not, therefore, means necessary to attain the end in view, and consequently not justified by the Constitution. The original act of incorporation, section 21, enacts "that no other bank shall be established by any future law of the United States during the continuance of the corporation hereby created, for which the faith of the United States is hereby pledged: _Provided_, Congress may renew existing charters for banks within the District of Columbia not increasing the capital thereof, and may also establish any other bank or banks in said District with capitals not exceeding in the whole $6,000,000 if they shall deem it expedient." This provision is continued in force by the act before me fifteen years from the 3d of March, 1836.