Mr. Adams, being appointed Minister Plenipotentiary of the United States to London, left us in June, and in July, 1785, Dr. Franklin returned to America, and I was appointed his successor at Paris. In February, 1786, Mr. Adams wrote to me, pressingly, to join him in London immediately, as he thought he discovered there some symptoms of better disposition towards us. Colonel Smith, his secretary of legation, was the bearer of his urgencies for my immediate attendance. I, accordingly, left Paris on the 1st of March, and, on my arrival in London, we agreed on a very summary form of treaty, proposing an exchange of citizenship for our citizens, our ships, and our productions generally, except as to office. On my presentation, as usual, to the King and Queen, at their levees, it was impossible for any thing to be more ungracious, than their notice of Mr. Adams and myself. I saw, at once, that the ulcerations of mind in that quarter left nothing to be expected on the subject of my attendance; and, on the first conference with the Marquis of Caermarthen, the Minister for foreign affairs, the distance and disinclination which he betrayed in his conversation, the vagueness and evasions of his answers to us, confirmed me in the belief of their aversion to have any thing to do with us. We delivered him, however, our Projet, Mr. Adams not despairing as much as I did of its effect. We afterwards, by one or more, notes, requested his appointment of an interview and conference, which, without directly declining, he evaded, by pretence of other pressing occupations for the moment. After staying there seven weeks, till within a few days of the expiration of our commission, I informed the minister, by note, that my duties at Paris required my return to that place, and that I should, with pleasure, be the bearer of any commands to his Ambassador there. He answered, that he had none, and, wishing me a pleasant journey, I left London the 26th, and arrived at Paris the 30th of April.
While in London, we entered into negotiations with the Chevalier Pinto, Ambassador of Portugal, at that place. The only article of difficulty between us was, a stipulation that our bread-stuff should be received in Portugal, in the form of flour as well as of grain. He approved of it himself, but observed that several nobles, of great influence at their court, were the owners of windmills in the neighborhood of Lisbon, which depended much for their profits on manufacturing our wheat, and that this stipulation would endanger the whole treaty. He signed it, however, and its fate was what he had candidly portended.