You will perceive by this letter, and the papers it encloses, what part of the ideas of Count d'Estaing correspond with our views. The answer to him must be a compound of civility and reserve, expressing our thankfulness for his attentions, that we consider them as proofs of the continuance of his friendly dispositions, and that though it might be out of our system to implicate ourselves in trans-Atlantic guarantees, yet other parts of his plans are capable of being improved to the common benefit of the parties. Be so good as to say to him something of this kind verbally, and so as that the matter may be ended as between him and us. On the whole, in the event of war, it is left to the judgment of the Marquis de La Fayette and yourself, how far you will develop the ideas now communicated to the Count de Montmorin, and how far you will suffer them to be developed to the Spanish court. I enclose you a pamphlet by Hutchins for your further information on the subject of the Mississippi; and am, with sentiments of perfect esteem and attachment, dear Sir, your most obedient, and most humble servant. TO COLONEL DAVID HUMPHREYS. New York, August 11, 1790. Sir,--The President having thought proper to confide several special matters in Europe to your care, it will be expedient that you take your passage in the first convenient vessel bound to the port of London. When there, you will be pleased to deliver to Mr. G. Morris and to Mr. Johnson, the letters and papers you will have in charge for them, to communicate to us from thence any interesting public intelligence you may be able to obtain, and then to take as early a passage as possible to Lisbon. At Lisbon, you will deliver the letter with which you are charged for the Chevalier Pinto, putting on it the address proper to his present situation. You know the contents of this letter, and will make it the subject of such conferences with him, as may be necessary to obtain our point of establishing there the diplomatic grade which alone coincides with our system, and of insuring its reception and treatment with the requisite respect. Communicate to us the result of your conferences, and then proceed to Madrid. There you will deliver the letters and papers which you have in charge for Mr. Carmichael, the contents of all which are known to you. Be so good as to multiply, as much as possible, your conferences with him, in order to possess him fully of the special matters sketched out in those papers, and of the state of our affairs in general. Your stay there will be as long as its object may require, only taking care to return to Lisbon by the time you may reasonably expect that our answers to your letters, to be written from Lisbon, may reach that place. This cannot be earlier than the first or second week of January. These answers will convey to you the President's further pleasure.