I had the honor to write to you on the 26th instant by the post, a conveyance which I am determined to try until I am certainly informed of its infidelity; in which case I will ask the favor of the French or Spanish Ambassador, to enclose my despatches.

I received, by the last post, a duplicate of despatches from Congress, the originals of which I received some time ago. I presume you have received the same from Congress, or from Passy; but, if otherwise, I will enclose in a future letter a commission and instructions for assisting at the conferences for peace, at Vienna or elsewhere, whenever they may take place. In this commission, Congress have added Mr Franklin, President Laurens, your Excellency, and Mr Jefferson; a measure which has taken off my mind a vast load, which, if I had ever at any time expected I should be called to sustain alone, would have been too heavy for my forces.

The capture of Cornwallis and his army is the most masterly measure, both in the conception and execution, which has been taken this war. When France and Spain shall consider the certain triumphant success, which will ever attend them while they maintain a naval superiority in the West Indies and on the coast of North America, it is to be hoped, they will never depart from that policy. Many here are of opinion, that this event will bring peace; but I am not of that mind, although it is very true that there are distractions in the British Cabinet, a formidable faction against Lord G. Germain, and, it is said, the Bedford party are determined to move for peace.

Our late triumphs have had an effect here. I have received several visits of congratulation, in consequence of them, from persons of consequence, from whom I did not expect them. But they are invisible fairies, who disconcert in the night all the operations of the patriots in the day.

There will, probably, be a proposal soon of a triple alliance between France, America, and Holland. If Spain would join, and make it quadruple, it would be so much the better.

General Green's last action in South Carolina, in consequence of which, that State and Georgia have both re-established their governments, is quite as glorious for the American arms as the capture of Cornwallis. The action was supported even by the militia, with a noble constancy. The victory on our side was complete, and the English lost twelve hundred men.

I have the honor to be, &c.

JOHN ADAMS.

TO THE PRESIDENT OF CONGRESS.