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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..
Growth in Trees. By D. T. MACDOUGAL....
The Action of Bases and Salts on Biocolloids ard Cell-Masses.
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
New Experiments in Gravitation. By CHARLES F. BRUSH..
Rose Atoll, American Samoa. By ALFRED GOLDSBOROUGH
Tobit's Blindness and Sara's Hysteria. By PAUL HAUPT.....
A New Hoplophoneus from the Titanotherium Beds. By WIL-
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-
logical Museum of Princeton University. By WILLIAM J.