THE AGE OF MAMMALS 



IN 



EUROPE, ASIA 

 AND NORTH AMERICA 



BY 



HENRY FAIRFIELD OSBORN 



LL.D. (Trinity, Princeton, Columbia), Hon. D.Sc. (Cambridge) 



VERTEBRATE PALEONTOLOGIST OF THE UNITED STATES GEOLOGICAL 

 SURVEY, DACOSTA PROFESSOR OF ZOOLOGY IN COLUMBIA 

 UNIVERSITY, CURATOR OF VERTEBRATE PALAEON- 

 TOLOGY IN THE AMERICAN MUSEUM OF 

 NATURAL HISTORY 



KEMINGTQN KELLOGG 



LIBRARY OF 



MARINE MAMMALOGY 



SMITHSONIAN INSTITUTION 



ILLUSTRATED 



StP 1 8 197? 



THE MACMILLAN COMPANY 



1910 



All riiihta Tf nerved 



