Philad July 26. 1806.
I sincerely regret my omission respecting the head of the Mammoth, not only an account of the delay which it has occasioned, but also because it has given you additional trouble—We want the intire Cranium or Scull, & also the external bones of the face—the Sockets of the tusks being very incomplete externally—I learn that there was part of a head among the bones lately at Pittsburgh, but have not yet been informed what part it was. Since I had the pleasure of writing to you the last time, I have received another letter from Pittsburgh, from a young Gentleman who passed thro’ that place on a journey, & inquired at my request after the bones in question—This is the second statement in writing which I have seen, like the first, it was drawn up by a person who has no knowledge of natural history or of Comparative Anatomy, but both of the accounts agree precisely in the description of the foot, that it was enormous, & that one Claw bone measured five feet—Doubtless there is a mistake in the matter, but the subject is well intitled to examination—The Gentleman who purchased these bones at Pittsburgh is a Mr Irvill or Arvill, of the town of Cincinnati, who removed them to his residence on their way to Europe. If there is any person at Cincinnati who could be applied to on the subject it would perhaps obviate the danger of their passing away without further inspection
With Sincere wishes for the Continuance of your health and happiness, I am most respectfully your obliged friend
C. Wistar Jun.
DLC: Papers of Thomas Jefferson.