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Gbophysics. — Present Status op Geodesy and Some of the Problems of This 
Branch of Geophysics .By William Bowie . 645 
The Problems op Seismology By Harry Fielding Reid 555 
The Status and Problems of Meteorology . . By C. F. Marvin 561 
Some of the Chief Problems in Terrestrlal Magnetism and Elec- 
tricity By Louis A . Bauer 572 
The Problems and Functions of the Section of Physical Ocean- 
ography OF the American Geophysical Union . . By G. W. Littlehales 580 
The Problems of Volcanology . . .By IJenry S. Washington 583 
An Outline op Geophysical-Chemical Problems 
By Robert B. Sosman 592 
Chemistry. — The Ionization of Strong Electrolytes 
By William D. Harkins 601 
Physics. — On a Condition for HelmholTz's Equation Similar to Lame's 
By Arthur Gordon Webster 605 
The Absorption of X-Rays by Chemical Elements of High Atomic 
Numbers . . . By William Duane, Hugo Fricke and Wilhelm Sten trom 607 
The Thomson Effect and Thermal Conduction in Metals 
By Edwin H. Hall 613 
Mathematics. — Motion on a Surface for any Positional Field of Force 
By Joseph Lipka 621 
