The power "to regulate:" Does this ever embrace the power to create or to construct? To say that it does is to confound the meaning of words of well-known signification. The word "regulate" has several shades of meaning, according to its application to different subjects, but never does it approach the signification of creative power. The regulating power necessarily presupposes the existence of something to be regulated. As applied to commerce, it signifies, according to the lexicographers, "to subject to rules or restrictions, as to regulate trade," etc. The Constitution itself is its own best expounder of the meaning of words employed by its framers. Thus, Congress have the power "to coin money." This is the creative power. Then immediately follows the power "to regulate the value thereof "--that is, of the coined money thus brought into existence. The words "regulate," "regulation," and "regulations" occur several times in the Constitution, but always with this subordinate meaning. Thus, after the creative power "to raise and support armies" and "to provide and maintain a navy" had been conferred upon Congress, then follows the power "to make rules for the government and regulation of the land and naval forces" thus called into being. So the Constitution, acting upon the self-evident fact that "commerce with foreign nations and among the several States and with the Indian tribes" already existed, conferred upon Congress the power "to regulate" this commerce. Thus, according to Chief Justice Marshall, the power to regulate commerce "is the power to prescribe the rule by which commerce is to be governed." And Mr. Madison, in his veto message of the 3d March, 1817, declares that-- "The power to regulate commerce among the several States" can not include a power to construct roads and canals and to improve the navigation of water courses, in order to facilitate, promote, and secure such commerce, without a latitude of construction departing from the ordinary import of the terms, strengthened by the known inconveniences which doubtless led to the grant of this remedial power to Congress.