PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



" FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LV. 1916. No. 7. 



CONTENTS 



PAGE 



Cooperation as a Factor in Evolution. William Patten .... 503 

 A Dynamical Theory of Antagonism. W. J. V. Osterhout .... 533 

 Minutes ix 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1916 



