The principal office of the executive department was thus provided for; but the ultimate choice of the Vice-President remained to be regulated. This office was unknown to the draft of the Constitution prepared by the committee of detail, and was suggested only when the mode of organizing the executive, and of providing for some of the separate functions of the Senate, came to be closely considered together. We are to look for its purposes, therefore, in the provisions specially devised for the settlement of these relations. In the first place, it was apparent that the executive would be a branch of the government that ought never to be vacant. The principle which, in hereditary monarchies, on the death of the sovereign, instantly devolves the executive power upon him who stands next in a fixed order of succession, must in some degree be imitated in purely elective governments, if great mischiefs are to be avoided. The difficulty which attends its application to such governments consists not in the nature of the principle itself, but in finding a number of public functionaries who can be placed in a certain order of succession, without creating mere heirs to the succession, for that purpose alone. In hereditary governments, the members of a family, in a designated order, stand as the successive recipients of the executive office; and each of them, until he reaches the throne, may have no other function in the state than that of an heir, near or remote, to the crown, and may, without inconvenience to the public welfare, occupy that position alone. But in elective, and especially in republican governments, the succession must be devolved on some person already filling some other office; for to designate as a successor to the chief magistrate a person who has no public employment, and no other public position than that of an heir apparent, would be attended with many obvious disadvantages, in such a government.