JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



VOLUME VI, 1916 



William R. Maxon 



NATIONAL MUSEUM 



BOARD OF EDITORS 

 N. Ernest Dorset 



BUREAU OP STANDARDS 



Adolph Knopf 



GEOLOGICAL SUBVET 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER. WHEN MONTHLY 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



