At a very early period of my life, contemplating the history of the aboriginal inhabitants of America, I was led to believe that if there had ever been a relation between them and the men of color in Asia, traces of it would be found in their several languages. I have therefore availed myself of every opportunity which has offered, to obtain vocabularies of such tribes as have been within my reach, corresponding to a list then formed of about two hundred and fifty words. In this I have made such progress, that within a year or two more I think to give to the public what I then shall have acquired. I have lately seen a report of Mr. Volney's to the Celtic academy, on a work of Mr. Pallas, entitled "Vocabulaires compares des langues de toute la terre;" with a list of one hundred and thirty words, to which the vocabulary is limited. I find that seventy-three of these words are common to that and to my vocabulary, and therefore will enable us, by a comparison of language, to make the inquiry so long desired, as to the probability of a common origin between the people of color of the two continents. I have to ask the favor of you to procure me a copy of the above work of Pallas, to inform me of the cost, and permit me to pay it here to your use; for I presume you have some mercantile correspondent here, to whom a payment can be made for you. A want of knowledge what the book may cost, as well as of the means of making so small a remittance, obliges me to make this proposition, and to restrain it to the sole condition that I be permitted to reimburse it here. I enclose you a letter for the Emperor, which be pleased to deliver or have delivered; it has some relation to a subject which the Secretary of State will explain to you. Accept my salutations, and assurances of esteem and consideration. TO THE EMPEROR OF RUSSIA. WASHINGTON, April 19, 1806. I owe an acknowledgment to your Imperial Majesty for the great satisfaction I have received from your letter of August the 20th, 1805, and embrace the opportunity it affords of giving expression to the sincere respect and veneration I entertain for your character. It will be among the latest and most soothing comforts of my life, to have seen advanced to the government of so extensive a portion of the earth, and at so early a period of his life, a sovereign whose ruling passion is the advancement of the happiness and prosperity of his people; and not of his own people only, but who can extend his eye and his good will to a distant and infant nation, unoffending in its course, unambitious in its views.