iv CONTENTS. 



Page. 



The Trial of Animals and Insects. By Hampton L. Carson. . 410 

 The Sex Ratio in the Domestic Fowl. By Raymond Pearl . . 416 

 Mechanism of Overgrowth in Plants. By Erwin F. Smith. . , 437 

 Recurrent Tetrahedral Deformations and Intercontinental Tor- 

 sions. By B. K. Emerson 445 



Early Man in America. By Edwin Swift Balch 473 



A Description of a New Photographic Transit Instrument. By 



Frank Schlesinger 484 



Studies of Inheritance in Pisum. By Orland E. White .... 487 

 Ecology and Physiology of the Red Mangrove. By H. H. M. 



Bowman , 589 



Eighteen New Species of Fishes from Northwestern South 



America. By Carl H. Eigenmann 673 



Descriptions of Sixteen New Species of Pygidiidae. By Carl 



H. Eigenmann 690 



Obituary Notices of Members Deceased : 



Sir William Ramsay, K.C.B iii 



Cleveland Abbe ix 



Minutes i 



Index xiv 



