But there, a scheme that seemed likely to elevate the Senate into a powerful oligarchy, and that would certainly put it in the power of seven States, not containing a third of the people, to elect the executive, when there failed to be a choice by the electors, met with strenuous resistance. For these and other reasons, not necessary to be recounted here, the ultimate choice of the executive was transferred from the Senate to the House of Representatives.[157] This change, if coupled with the concession of revenue bills to the House, without the right to amend in the Senate, would have thrown a large balance of power into the former assembly; and in order to prevent this inequality, a provision was made, in the words used in the Constitution of Massachusetts, that the Senate might propose or concur with amendments, as on other bills. With this addition, the restriction of the origin of bills for raising revenue to the House of Representatives finally passed, with but two dissentient votes.[158] The qualifications of the Senators had been made superior in some respects to those of the members of the House of Representatives, on account of the peculiar duties which it was intended they should discharge, and the length of their term of office. They were to be of the age of thirty years; to be inhabitants of the States for which they might be chosen; and in the report of the committee of detail the period of four years' citizenship was made one of the requirements. But so great was the jealousy of foreign influence, and so important was the position of a senator likely to become, that, when this particular qualification came to be considered, it was found to be altogether impossible to make so short a period of citizenship acceptable to a majority. According to the plan then contemplated, the Senate was to be a body of great power. Its legislative duties were to form but a part of its functions. It was to have the making of treaties, and the appointment of ambassadors and judges of the Supreme Court, without the concurrent action of any other department of the government. In addition to these special powers, it was to have a concurrent vote with the House of Representatives in the election of the executive. It was also to exercise the judicial function of hearing and determining questions of boundary between the States. This formidable array of powers, which were subsequently much modified or entirely taken away, but which no one could then be sure would not be retained as they had been proposed, rendered it necessary to guard the Senate with peculiar care. A very animated discussion, in which the same reasons were urged on both sides which had entered into the debate on the qualifications of the representatives, enforced by the peculiar dangers to which the Senate might be exposed, at length resulted in a vote establishing the period of nine years' citizenship as a qualification for the office of a senator.[159]