In one of your letters of March the 13th, you express your apprehension that some of the belligerent powers may stop our vessels going with grain to the ports of their enemies, and ask instructions which may meet the question in various points of view, intending, however, in the mean time, to contend for the amplest freedom of neutral nations. Your intention in this is perfectly proper, and coincides with the ideas of our own government in the particular case you put, as in general cases. Such a stoppage to an unblockaded port would be so unequivocal an infringement of the neutral rights, that we cannot conceive it will be attempted. With respect to our conduct, as a neutral nation, it is marked out in our treaties with France and Holland, two of the belligerent powers: and as the duties of neutrality require an equal conduct to both parties, we should, on that ground, act on the same principles towards Great Britain. We presume that this would be satisfactory to her, because of its equality, and because she too has sanctioned the same principles in her treaty with France. Even our seventeenth article with France, which might be disagreeable, as from its nature it is unequal, is adopted exactly by Great Britain in her fortieth article with the same power, and would have laid her, in a like case, under the same unequal obligations against us. We wish then, that it could be arranged with Great Britain, that our treaties with France and Holland, and that of France and Great Britain (which agree in what respects neutral nations), should form the line of conduct for us all, in the present war, in the cases for which they provide. Where they are silent, the general principles of the law of nations must give the rule, as the principles of that law have been liberalized in latter times by the refinement of manners and morals, and evidenced by the declarations, stipulations, and practice of every civilized nation. In our treaty with Prussia, indeed, we have gone ahead of other nations, in doing away restraints on the commerce of peaceful nations, by declaring that nothing shall be contraband. For in truth, in the present improved state of the arts, when every country has such ample means of procuring arms within and without itself, the regulations of contraband answer no other end than to draw other nations into the war. However, as other nations have not given sanction to this improvement, we claim it, at present, with Prussia alone. You are desired to persevere till you obtain a regulation to guard our vessels from having their hands impressed, and to inhibit the British navy-officers from taking them under the pretext of their being British subjects. There appears but one practicable rule, that the vessel being American, shall be conclusive evidence that the hands are so to a certain number, proportioned to her tonnage. Not more than one or two officers should be permitted to visit a vessel. Mr. Albion Coxe has just arrived.