Vol. VI No, 4 



February 19, 1916 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 William R. Maxon Edson S. Bastin N. Ernest Dorset 



NATIONAL MUSEUM GEOLOGICAL 8UBVEY BUREAU OB" STMNrMUDS 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST, AND SEPTEMBER. WHEN MONTHLY 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS CO. 



BALTIMORE, Mt>. 



Entered as second-class matter July 14, 1911, at the post office (it Baltimore, Maryland, under the Aot of 



July 16, 1894 



