CONTENTS. 



Officers and Committees for 1891 iv 



Proceedings, February 8th to December 26th, 1891 . . . ^ . . v-xix 



Addresses and Communications: 



On Dynamic Influences in Evolution, by Wm. H. Dall (read 



March 8th, 1890) i-io 



Neo-Darwinism and Neo-Lamarckism, by Lester F. Ward 



(January 24th, 1891) 11-71 



