Are you sure that the intelligence you heard respecting M. Mirales is _certain_? I am sorry by this question to lengthen your next letter, especially as writing in cypher is tedious and disagreeable. But that intelligence is important; if credited, it may have an influence on American measures, which, if it should be groundless, might be injurious. The transmission of information to Congress, by which their councils and determinations may be affected, is a very delicate business, and demands the greatest care and precision. It is not uncommon, you know, for one gentleman to think a matter certain, which another of no greater discernment, and judging by the same evidence, will deem somewhat doubtful. I would choose, therefore, with respect to all interesting intelligence, and particularly such as I may transmit to Congress, to possess as far as possible every circumstance necessary to form a judgment of its credibility, such as the rank and character of the informants, and the means they have of acquiring the information they give, that I may represent it as entitled to that degree of credit only, which, on full consideration, it may appear to deserve. I observe this less with reference to the case in question than as a general rule. Besides, as we correspond in cypher, no danger can result from being explicit. I am well satisfied that the short time you had been at Madrid did not admit of your writing on the several subjects contained in your instructions, on all of which, if allowed sufficient time, I am persuaded you will be able to obtain important information. However, as the object of your going to Madrid was to prevent delays in my receiving an answer to the letter to M. Galvez, the other instructions, however important, are to be considered as secondary, and though I wish that great and constant attention may be paid them, yet by no means to the neglect or prejudice of the first. I am much obliged to you for the American paper enclosed in your letter. Everything from our country is interesting. If you should find any more of them, whose contents afford either information or entertainment, send them, and you shall receive from me all I may meet with here, which come under that description. The letter you gave me reason to expect from M. Gerard has not yet arrived; perhaps the next post will bring it. On the first occasion I have of writing to him, I shall take the liberty of mentioning the sense you have of his personal kindness and attention to you. The polite offers of the French Ambassador to be useful to me in all things that depend on him at Madrid, as well as his civilities to you, demand my acknowledgments, which I must beg the favor of you to present to him. I am, Dear Sir, &c. JOHN JAY. * * * * * TO THE PRESIDENT OF CONGRESS. Cadiz, February 29th, 1780. Sir,