The livraison of your astronomical observations, and the 6th and 7th on the subject of New Spain, with the corresponding atlasses, are duly received, as had been the preceding cahiers. For these treasures of a learning so interesting to us, accept my sincere thanks. I think it most fortunate that your travels in those countries were so timed as to make them known to the world in the moment they were about to become actors on its stage. That they will throw off their European dependence I have no doubt; but in what kind of government their revolution will end I am not so certain. History, I believe, furnishes no example of a priest-ridden people maintaining a free civil government. This marks the lowest grade of ignorance, of which their civil as well as religious leaders will always avail themselves for their own purposes. The vicinity of New Spain to the United States, and their consequent intercourse, may furnish schools for the higher, and example for the lower classes of their citizens. And Mexico, where we learn from you that men of science are not wanting, may revolutionize itself under better auspices than the Southern provinces. These last, I fear, must end in military despotisms. The different casts of their inhabitants, their mutual hatreds and jealousies, their profound ignorance and bigotry, will be played off by cunning leaders, and each be made the instrument of enslaving the others. But of all this you can best judge, for in truth we have little knowledge of them to be depended on, but through you. But in whatever governments they end they will be _American_ governments, no longer to be involved in the never-ceasing broils of Europe. The European nations constitute a separate division of the globe; their localities make them part of a distinct system; they have a set of interests of their own in which it is our business never to engage ourselves. America has a hemisphere to itself. It must have its separate system of interests, which must not be subordinated to those of Europe. The insulated state in which nature has placed the American continent, should so far avail it that no spark of war kindled in the other quarters of the globe should be wafted across the wide oceans which separate us from them. And it will be so. In fifty years more the United States alone will contain fifty millions of inhabitants, and fifty years are soon gone over. The peace of 1763 is within that period. I was then twenty years old, and of course remember well all the transactions of the war preceding it. And you will live to see the epoch now equally ahead of us; and the numbers which will then be spread over the other parts of the American hemisphere, catching long before that the principles of our portion of it, and concurring with us in the maintenance of the same system. You see how readily we run into ages beyond the grave; and even those of us to whom that grave is already opening its quiet bosom. I am anticipating events of which you will be