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 A Natural Group of Unusual Black Oaks. By WILLIAM TRE- The Fixed Glacial Anticyclone Compared to the Migrating Anti- cyclone. By WILLIAM HERBERT HOBBS.. Discussion of a Kinetic Theory of Gravitation, and II, Some Tobit's Blindness and Sara's Hysteria. By PAUL HAUPT... 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... The "Turtle-Oreodon Layer" or "Red Layer," a Contribution to the Stratigraphy of the White River Oligocene (Results of the Princeton University 1920 Expedition to South Dakota). Entelodonts from the Big Badlands of South Dakota in the Geo- |