Dear Sir,--This letter will be delivered to you by Colonel Humphreys, whose character is so well known to you as to need no recommendations from me. The present appearances of war between our two neighbors Spain and England, cannot but excite all our attention. The part we are to act is uncertain, and will be difficult. The unsettled state of our dispute with Spain, may give a turn to it very different from what we would wish. As it is important that you should be fully apprized of our way of thinking on this subject, I have sketched, in the enclosed paper, general heads of consideration arising from present circumstances. These will be readily developed by your own reflections, and in conversations with Colonel Humphreys; who, possessing the sentiments of the executive on this subject, being well acquainted with the circumstances of the Western country in particular, and of the state of our affairs in general, comes to Madrid expressly for the purpose of giving you a thorough communication of them. He will, therefore, remain there as many days or weeks as may be necessary for this purpose. With this information, written and oral, you will be enabled to meet the minister in conversations on the subject of the navigation of the Mississippi, to which we wish you to lead his attention immediately. Impress him thoroughly with the necessity of an early, and even an immediate settlement of this matter, and of a return to the field of negotiation for this purpose; and though it must be done delicately, yet he must be made to understand unequivocally, that a resumption of the negotiation is not desired on our part, unless he can determine, in the first opening of it, to yield the immediate and full enjoyment of that navigation. (I say nothing of the claims of Spain to our territory north of the thirty-first degree, and east of the Mississippi. They never merited the respect of an answer; and you know it has been admitted at Madrid, that they were not to be maintained.) It may be asked, what need of negotiation, if the navigation is to be ceded at all events? You know that the navigation cannot be practised without a port, where the sea and river vessels may meet and exchange loads, and where those employed about them may be safe and unmolested. The right to use a thing, comprehends a right to the means necessary to its use, and without which it would be useless. The fixing on a proper port, and the degree of freedom it is to enjoy in its operations, will require negotiation, and be governed by events. There is danger, indeed, that even the unavoidable delay of sending a negotiator here, may render the mission too late for the preservation of peace. It is impossible to answer for the forbearance of our western citizens. We endeavor to quiet them with the expectation of an attainment of their rights by peaceable means. But should they, in a moment of impatience, hazard others, there is no saying how far we may