CONTENTS 



PAGE 



The Origin and Distribution of the Genera of the Fishes of 

 South America West of the Maracaibo, Orinoco, Amazon and 

 Titicaca Basins. By Carl H. Eigenmann i 



Growth in Trees. By D. T. Macdougal 7 



The Action of Bases and Salts on Biocolloids and Cell-Classes. 

 By D. T. Macdougal 15 



A Natural Group of Unusual Black Oaks. By William Tre- 

 LEASE 31 



The Fixed Glacial Anticyclone Compared to the Migrating Anti- 

 cyclone. By William Herbert Hobbs 34 



Discussion of a Kinetic Theory of Gravitation, and II, Some 

 New Experiments in Gravitation. By Charles F. Brush . . 43 



Rose Atoll, American Samoa. By Alfred Goldsborough 

 Mayor 62 



Tobit's Blindness and Sara's Hysteria. By Paul Haupt 71 



A New Hoplophoneus from the Titanotherium Beds. By Wil- 

 liam J. Sinclair 96 



The Control of the Foreign Relations of the United States : The 

 Relative Rights, Duties, and Responsibilities of the President, 

 of the Senate and the House, and of the Judiciary, in Theory 

 and in Practice. By Quincy Wright 99 



The " Turtle-Oreodon Layer " or " Red Layer," a Contriljution 

 to the Stratigraphy of the White River Oligocene (Results of 

 the Princeton University 1920 Expedition to South Dakota). 

 By William J. Sinclair 456 



Entelodonts from the Big Badlands of South Dakota in the Geo- 

 logical Museum of Princeton University. By William J, 

 Sinclair 467 



iii 



