In what I have said on the method of classing, I have not at all meant to insinuate that that of Linnæus is intrinsically preferable to those of Blumenbach and Cuvier. I adhere to the Linnean because it is sufficient as a ground-work, admits of supplementary insertions as new productions are discovered, and mainly because it has got into so general use that it will not be easy to displace it, and still less to find another which shall have the same singular fortune of obtaining the general consent. During the attempt we shall become unintelligible to one another, and science will be really retarded by efforts to advance it made by its most favorite sons. I am not myself apt to be alarmed at innovations recommended by reason. That dread belongs to those whose interests or prejudices shrink from the advance of truth and science. My reluctance is to give up an universal language of which we are in possession, without an assurance of general consent to receive another. And the higher the character of the authors recommending it, and the more excellent what they offer, the greater the danger of producing schism. I should seem to need apology for these long remarks to you who are so much more recent in these studies, but I find it in your particular request and my own respect for it, and with that be pleased to accept the assurance of my esteem and consideration. JOHN ADAMS TO THOMAS JEFFERSON. QUINCY, February, 1814. DEAR SIR,--I was nibbing my pen and brushing my faculties, to write a polite letter of thanks to Mr. Counsellor Barton, for his valuable memoirs of Dr. Rittenhouse, (though I could not account for his sending it to me), when I received your favor of January 25th. I now most cordially endorse my thanks over to you. The book is in the modern American style, an able imitation of Marshall's Washington, though far more entertaining and instructive; a Washington Mausoleum; an Egyptian pyramid. I shall never read it any more than Taylor's aristocracy. Mrs. Adams reads it with great delight, and reads to me what she finds interesting, and that is indeed the whole book. I have not time to hear it all. Rittenhouse was a virtuous and amiable man, an exquisite mechanician, master of the astronomy known in his time; an expert mathematician, a patient calculator of numbers. But we have had a Winthrop, an Andrew Oliver, a Willard, a Webber, his equals, and we have a Bowditch his superior in all these particulars, except the mechanism. But you know Philadelphia is the heart, the censorium, the pineal gland of the United States.