CONTENTS

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...

PAGE

7

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

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...

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

MAYOR

34

43

62

Tobit's Blindness and Sara's Hysteria. By PAUL HAUPT....

A New Hoplophoneus from the Titanotherium Beds. By WIL-

LIAM J. SINCLAIR....

71

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...

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).

By WILLIAM J. SINCLAIR..

99

456

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

logical Museum of Princeton University. By WILLIAM J.

SINCLAIR

467

iii