Work in the Dakota Group 31 



the material which I have gathered from the rocks 

 of the earth. 



"' I might have sold to showmen or dealers ; in fact 

 I have the assurance of one of the largest dealers 

 in America that I made a great mistake in selling 

 directly to museums instead of through him. If 

 I had done as he advised, the thousands of fossils I 

 have collected would have cost the museums fifty 

 per cent, more than they have, and my work would 

 have been measured by the money these dealers 

 would have been pleased to allow me, and I should 

 never have been known as one of those who have 

 devoted their lives to the advancement of paleon- 

 tology. 



