CONTENTS 
Page 
Physics. — The High Frequency Spectrum of Tungsten 
By Albert W. Hull and Marion Rice 265 
Mathematics. — On the Foundations op Plane Analysis Situs 
By Robert L. Moore 270 
Mathematics. — A General Theory of Surfaces 
By Edwin B. Wilson and C. L. E. Moore 273 
Engineering. — Dynamical Stability of Aeroplanes . By Jerome C. Hunsaker 278 
Geography. — Clift Islands in the Coral Seas . . . . By W. M. Davis 284 
Astronomy.— On Some Relations Between the Proper Motions, Radial Velo- 
cities, and Magnitudes of Stars of Classes B and A . By C. D. Perrine 289 
Astronomy. — ^Asymmetry m the Proper Motions and Radial Velocities of 
Stars of Class B and Their Possible Relation to a Motion of Rotation 
By C. D. Perrine 292 
Engineering. — ^Theory of an Aeroplane Encountering Gusts 
By Edwin Bidwell Wilson 294 
Anthropology. — ^Terms of Relationship and Social Organization 
By Truman Michelson 297 
Report of the Annual Meeting .... Prepared by the Home Secretary 300 
