336 BIOLOGY AND ITS MAKERS 
the subject should be followed here in detail. The collec- 
tions of material upon which paleontologists are working 
have been enormously increased, and there is perhaps no 
place where activity has been greater than in the United 
States. The rocks of the Western States and Territories 
Fic. 1oo.—E. D. Copg, 1840-1897. 
embrace a very rich collection of fossil forms, and, through 
the generosity of several wealthy men, exploring parties have 
been provided for and immense collections have been brought 
back to be preserved in the museums, especially of New 
Haven, Conn., and in the American Museum of Natural His- 
tory in New York City. 
