Sir, this is a novel idea. At the time when these measures were before Congress in 1850, when the questions involved in them were discussed from day to day, from week to week, and from month to month, in this Senate chamber, who ever heard that the Missouri prohibition was to be superseded? What man, at what time, in what speech, ever suggested the idea that the acts of that year were to affect the Missouri compromise? The Senator from Illinois the other day invoked the authority of Henry Clay--that departed statesman, in respect to whom, whatever may be the differences of political opinion, none question that, among the great men of this country, he stood proudly eminent. Did he, in the report made by him as the chairman of the Committee of Thirteen, or in any speech in support of the compromise acts, or in any conversation in the committee, or out of the committee, ever even hint at this doctrine of supersedure? Did any supporter or any opponent of the compromise acts ever vindicate or condemn them on the ground that the Missouri prohibition would be affected by them? Well, sir, the compromise acts were passed. They were denounced North, and they were denounced South. Did any defender of them at the South ever justify his support of them upon the ground that the South had obtained through them the repeal of the Missouri prohibition? Did any objector to them at the North ever even suggest as a ground of condemnation that that prohibition was swept away by them? No, sir! No man, North or South, during the whole of the discussion of those acts here, or in that other discussion which followed their enactment throughout the country, ever intimated any such opinion. Now, sir, let us come to the last session of Congress. A Nebraska bill passed the House and came to the Senate, and was reported from the Committee on Territories by the Senator from Illinois, as its chairman. Was there any provision in it which even squinted toward this notion of repeal by supersedure? Why, sir, Southern gentlemen opposed it on the very ground that it left the Territory under the operation of the Missouri prohibition. The Senator from Illinois made a speech in defence of it. Did he invoke Southern support upon the ground that it superseded the Missouri prohibition? Not at all. Was it opposed or vindicated by anybody on any such ground? Every Senator knows the contrary. The Senator from Missouri (Mr. Atchison), now the President of this body, made a speech upon the bill, in which he distinctly declared that the Missouri prohibition was not repealed, and could not be repealed. I will send this speech to the Secretary, and ask him to read the paragraphs marked. The Secretary read as follows: "I will now state to the Senate the views which induced me to oppose this proposition in the early part of this session.