Those who insist upon preserving freedom in the Territories, have no desire to disturb the institution of slavery in the States. The Constitution confers upon them no such authority. They could not interfere with it if they would, and they would not if they could. They have ever heretofore been, and still are, ready strictly to fulfil the constitutional provisions upon this subject. I shall aim to discuss this question with a proper regard for the most sensitive feelings of our brethren of the slave States, but also, sir, with a plainness commensurate with its profound importance. The legislatures of thirteen of the States of the Union, including Delaware, which still has two thousand slaves, have passed resolutions instructing their Senators and requesting their Representatives in Congress to oppose any further extension of slavery. There is but one sentiment upon this subject throughout the free States--it is that of eternal and _uncompromising_ hostility to the project. They will never consent that the free and virgin soil of the Territories shall be blighted and cursed by the tears of the slave, while they have a will to determine, or a muscle to resist. The proposition to make this Government the instrument for planting slavery upon soil now free, is regarded by a few at the North as so improbable and monstrous, that they have refused to believe that it is seriously entertained. Startling as the proposal is, it is nevertheless true. * * * * *