The conclusion is irresistible, that the National Constitution, when providing a presiding officer for the trial of the President of the United States, used the term _preside_ in the sense already acquired in Parliamentary Law, and did not intend any different signification; that our fathers knew perfectly well the parliamentary distinction between a presiding officer a member of the House and a presiding officer not a member; that, in constituting the Chief Justice presiding officer for a special temporary purpose, they had in view similar instances in the mother country, when the Lord Keeper, Chief Justice, or other judicial personage, had been appointed to preside over the House of Lords, of which he was not a member, as our Chief Justice is appointed to preside over the Senate, of which he is not a member; that they found in this constantly recurring example an apt precedent for their guidance; that they followed this precedent to all intents and purposes, using received parliamentary language, “the Chief Justice shall preside,” and nothing more; that, according to this precedent, they never intended to invest the Chief Justice, President _pro tempore_ of the Senate, with any other powers than those of a presiding officer not a member of the body; and that these powers, exemplified in an unbroken series of instances extending over centuries, under different kings and through various administrations, were simply to put the question and to direct generally the conduct of business, without undertaking in any way, by voice or vote, to determine any question, preliminary, interlocutory, or final. In stating this conclusion I present simply the result of the authorities. It is not I who speak; it is the authorities. My own judgment may be imperfect; but here is a mass of testimony, concurring and cumulative, without a single exception, which cannot err. Plainly and unmistakably, the provision in our Constitution authorizing the Chief Justice to _preside_ in the Senate, of which he is not a member, was modelled on the English original. This, according to the language of Mr. Wirt, was the “archetype” our fathers followed. As such it was embodied in the National Constitution, as if the text expressly declared that the Chief Justice, when presiding in the Senate, had all the powers accorded by parliamentary usage to such a functionary when presiding in the upper House of Parliament without being a member thereof. In saying that he shall “preside” the Constitution confers no powers of membership, and by the well-defined term employed limits him to those precise functions sanctioned at the time by immemorial usage. * * * * *