APPENDIX. 177 



' D. — Page 82. 



The following letters from Dr. Cohen, of Baltimore, are published in support of the text. 

 They, with other evidence here adduced, seem to form a complete chain, going to show, first, that 

 this tooth was actually exhumed in this country ; and, second, that after it had disappeared it was 

 recovered by a remarkable coincidence, and deposited in the Museum of the Academy of Sciences 

 at Philadelphia. Dr. Cohen is well known for his scientific acquirements, and particularly for 

 his knowledge of mineralogy. His accuracy and impartiality are unquestionable. I must 

 therefore consider myself peculiarly fortunate in being able to apply to a friend who was so 

 well adapted to the investigation of the subject, and so favorably disposed to undertake it. 



There will be found some discrepancy in the two statements of Dr. Ducatel as to the ex- 

 pression of opinion by i\Ir. Charlesworth and Sir Charles Lyell. The declaration of the latter 

 gentleman, however, published in the " Geological Journal," 1843, makes it clear that Mi-. 

 Charlesworth had characterized the tooth as belonging to Mastodon Longirostris. The discre- 

 pancy does not at all invalidate the account of the principal facts. 



DR. COHEN TO DR. WARREX. 



Juyie 19, 1848. — "I did not wish to write until I could give you the information which 

 you desired in regard to the fossil bone. But all my efforts, and they have been almost daily 

 ones, have not enabled me to procure it from Dr. Ducatel, with whom I left your letter, and 

 from whom I am still to hear. I will no longer delay my acknowledgments ; assuring you, that, 

 so soon as I can get Dr. Ducatel to give me the information sought, I will write you a<*ain. I 

 have no knowledge of the matter myself." 



Sept. 12, 1848. — " Since I had the pleasure of addressing you in reply to your letter on the 

 subject of the fossil tooth, Dr. Ducatel had promised me, from day to day, to give me a memo- 

 randum to forward you in regard to it, and at the same time to send the original memorandum 

 made by Mr. Charlesworth, who had examined the tooth. As he tells me to-day, he has in vain 

 sought among his papers for this letter ; he desires me to say now that the information you have 

 on the subject, derived from Mr. Lyell, is correct; and that this is the history of the fossil: 



" "When Dr. Ducatel was on the Eastern Shore of Maryland, engaged in his geological 

 survey, and at Greensburg, Caroline County, he caused the marl-beds at this place to be opened 

 and requested Dr. Tilden on the spot to forward to him such specimens as might be thrown out. 



