CONTENTS 



Page 



Original Papers 



Physics. — The compressibility of diamond. L. H. Adams 45 



Electrical Engineering. — Oscillograph measurements of the instantaneous values of 



cxirrent and voltage in the battery circuit of automobiles. G. W. Vinal and C. I/. 



Snyder •"" 51 



Abstracts 



Botany 54 



Entomology 55 



Ethnology 55 



Evolution 56 



Geology 56 



Navigation 59 



Ornithology 59 



Proceedings 



Biological Society 64 



Scientific Notes and News 67 



OFFICERS OF THE ACADEMY 

 President: Al,frEd H. Brooks, Geological Survey. 

 Corresponding Secretary: Robert B. Sosman, Geophysical Laboratory. 

 Recording Secretary: William R. Maxon, National Museum. 

 Treasurer: R. L. Faris, Coast and Geodetic Survey, 



