1912.] natural sciences of philadelphia. 491 



November 19. 

 The President, Samuel G. Dixon, M.D., LL.D., in the Chair. 



Forty-nine persons present. 



The death of Clement A. Griscom, a member, on November 10, 

 1912, was announced. 



The reception of a paper entitled "Notes on a prehistoric race of 

 Yucatan," by R. W. Shufeldt, M.D. (November 12), was reported 

 by the Publication Committee. 



Dr. Philip P. Calvert made an illustrated communication on 

 waterfall-inhabiting dragonflies of Costa Rica. 



Horace E. Smith was elected a member. 



The following was ordered to be printed: 



