VERTEBRATE PALEONTOLOGY 241 



private collection of Professor Cope, which of course 

 included a large number of types. The American 

 Museum collection thus contains not only a vast series 

 of representative specimens from every class and order 

 of vertebrates, secured by purchase or expedition from 

 nearly all the great localities of the world, but an exhi- 

 bition series of skulls and partial and entire skeletons 

 and restorations which no other institution can hope to 

 equal. Based upon this wonderful material is a large 

 amount of research, filling many volumes, published for 

 the greater part in the bulletin and memoirs of the 

 Museum. This research is not only the product of the 

 staff, including Walter Granger, Barnum Brown, W. D. 

 Matthew, and W. K. Gregory, but also of a number of 

 other American and some foreign paleontologists as well. 



Professor Osborn's own work has been voluminous, his 

 bibliography from 1877 to 1916 containing no fewer than 

 441 titles, ranging over the fields of paleontology, which 

 of course includes the greater number geology, correla- 

 tion and paleogeography, evolutionary principles exem- 

 plified in the Mammalia, man, neurology and embry- 

 ology, biographies, and the theory of education. 



In paleontology, Osborn's researches have been largely 

 with the Reptilia and Mammalia, partly morphological, 

 but also taxonomic and evolutional. Faunistic studies 

 have also been made of the mammals. Of his published 

 volumes the most important are, first, the Age of Mam- 

 mals (1910), in which he treats not of evolutionary series 

 of phylogenies, but of faunas and their origin, migra- 

 tions, and extinctions, and of the correlation of Old and 

 New World Tertiary deposits and their contents. Men 

 of the Old Stone Age (1916) is an exhaustive treatise and 

 is the first full and authoritative American presentation 

 of what has been discovered up to the present time 

 throughout the world in regard to human prehistory. In 

 his latest volume, The Origin and Evolution of Life 

 (1917), Osborn presents a new energy conception of evo- 

 lution and heredity as against the prevailing matter and 

 form conceptions. In this volume there is summed up 

 the whole story of the origin and evolution of life on 

 earth up to the appearance of man. This last book is 

 novel in its conceptions, but it is too early as yet to judge 



