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EXTINCT MONSTERS. 
assistant, Mr. J. B. Hatcher, who has done so much to bring to 
light the ancient life 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. 
