Mr. JOHNSON, of Missouri:--The Supreme Court has already decided, in terms which are not ambiguous, that Congress has no right, under the Constitution, to prohibit slavery in the Territories. Now, our brethren of the North propose to give us the Missouri Compromise. What do they mean? Do they intend to give us a substantial right--one that we can enforce and rely upon, or do they intend to keep it from us? They are shrewd as well as honorable men. They know that the effect of this amendment will be to leave the territory south of the line, without the slightest acknowledgment or guaranty, just where it is at the present time, so far as slavery is concerned. The construction placed upon the Missouri Compromise was, that the prohibition of slavery north of the line which it established, implied the right of holding slaves south of the line. At the time of its adoption there was, in respect of this construction, no difference of opinion: Such was the construction of Mr. WEBSTER. Now you propose to leave it still for Congress to legislate as to the territory south. You secure that north, by a prohibition in the Constitution; you will get that south, by the action of Congress. The decision in the Dred Scott case may be reversed. It afforded no permanent protection. One of your leaders (Mr. WILMOT) says he will war against it. The gentleman from New York (Mr. SMITH) denies the force of the decision in this respect. Now, gentlemen, all we of the South want, is to have this question settled. You know well that the adoption of this amendment, so far from settling it, leaves it all open; or rather it settles the question North, and leaves it open South. The country is in danger--that all concede. Will you, because you do not agree in opinion with the Supreme Court, refuse to join us in one more effort to save the country? Mr. CLAY:--I have not unnecessarily occupied a moment of the time of this Conference, and it is not now my intention to occupy the whole ten minutes to which I am entitled. But I do wish to express some of the opinions which I entertain upon the questions immediately under our consideration. "Red Gauntlet" has been cited as an authority in this body, but I think I might cite another of the same class which would be more in point. It is the "Bleak House," by Charles Dickens, in which the circumlocution office is so graphically described. It would be decidedly more appropriate to our present action.