SCIENCE OF FOSSIL LIFE 339 
been collected which supply a panoramic view of the line of 
descent of horses, of camels, of rhinoceroses, and of other 
animals. The most fruitful worker in this field at the present 
time is perhaps Henry F. Osborn, of the American Museum 
Fic. 102.—KaRL VON ZITTEL, 1839-1904. 
of Natural History, New York City. His profound and 
important investigations in the ancestry of animal life are 
now nearing the time of their publication in elaborated 
form. 
