I address you not only as a delegate from Pennsylvania to the Charleston Democratic National Convention, but as an old and valued friend. Whilst trusting that no member of that body will propose my name as a candidate for reëlection, yet, lest this might possibly prove to be the case, I require you, then, immediately to inform the Convention, as an act of justice to myself, that in no contingency can I ever again consent to become a candidate for the Presidency. My purpose to this effect was clearly indicated both in accepting the Cincinnati nomination, and afterwards in my inaugural address, and has since been repeated on various occasions, both public and private. In this determination neither my judgment nor my inclination has ever for a moment wavered. Deeply grateful to the great Democratic party of the country, on whose continued ascendancy, as I verily believe, the prosperity and perpetuity of our Confederate Republic depend, and praying Heaven that the Convention may select as their candidate an able, sound and conservative Democrat, in whose support we can all cordially unite.—I remain, very respectfully, your friend, JAMES BUCHANAN. It is not at all difficult to see what Mr. Buchanan would have recommended if he had been asked to shape the action of his party. It is well known that he held it to be both right and expedient to recognize the claim of Southern emigrants into the Territories to an equal participation in the common domain of the Union, so far as to have their property in slaves admitted during the continuance of the Territorial condition. But he would have qualified this claim of right by the application of the principle of the Missouri Compromise; that is, by admitting it in Territories south of the line of 36° 30´, and by excluding it in Territories north of that line. This had been the former practice of Congress, and there could be no good reason now for not expecting the people of the North to make this concession to the South, excepting that Mr. Douglas had indoctrinated a portion of the Northern Democrats with his panacea of “popular sovereignty,” which was just as unacceptable to the South as the principles of the “Chicago platform.”