I20 EXTINCT MONSTERS. 



assistant, Mr. J. B. Hatcher, who has done so much to bring to 

 light the ancient Hfe of the Rocky Mountain regions. I can only- 

 claim to have shared a few of the dangers and hardships with 

 him, but without his skill little would have been accomplished. 

 If you will bear in mind that two of the skulls weighed nearly 

 two tons each, when partially freed from their matrix and ready 

 for shipment, in a deep desert canon, fifty miles from a railway, 

 you will appreciate one of the mechanical difficulties overcome. 

 When I add that some of the most interesting discoveries were 

 made in the hunting-grounds of the hostile Sioux Indians, who 

 regard such explorations with superstitious dread, you will under- 

 stand another phase of the problem. I might speak of even 

 greater difficulties and dangers, but the results attained repay all 

 past efforts, and I hope at no distant day to have something 

 more of interest to lay before you." ^ 



* American Journal of Science, vol. xli. p. 176. 



