186 EXTINCT MONSTERS 
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.” * 
1 American Journal of Science, vol. xli. p. 176. 
