o?; 



THE ORIGIN AND 

 EVOLUTION OF LIFE 



ON THE THEORY OF ACTION 

 REACTION AND INTERACTION OF ENERGY 



BY 



HENRY FAIRFIELD OSBORN 



SC.D. PRINCETON, HON. LL.D. TRIXITY, PRINCETON, COLUMBIA, HON. D.SC. CAMBRIDGE 

 HON. PH.D. CHRISTIANIA 



RESEARCH PROFESSOR OF ZOOLOGY, COLUMBIA UNIVERSITY 



VERTEBRATE PALEONTOLOGIST U. S. GEOLOGICAL SURVEY, CURATOR EMERITUS OF VERTEBRATE 



PALAEONTOLOGY IN THE AMERICAN MUSEUM OF NATURAL HISTORY 



AUTHOR OF "from THE GREEKS TO DARWIN " 



"the AGE OF M.^MMALS," "MEN OF THE OLD STONE AGE 



WITH 1^6 ILLUSTRATIONS 



NEW YORK 



CHARLES SCRIBNER'S SONS 



1917 



