JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



VOLUME V, 1915 



BOARD OF EDITORS 

 Fred. E. Wright William R. Maxon Edson S. Bastin 



GEOPHYSICAL LABORATORY NATIONAL MUSEUM GEOLOGICAl SURVEY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF publication 



THE WAVERLY press 



BALTIMORE, MD. 



