^-- — 



Vol. VI No. 3 



February 4, 1916 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

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



NATIONAL MUSEUM GEOLOGICAL 8DRVET BUREAU 07 STANDARDS 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



m BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS CO. 



BALTIMORE, MD. 



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

 , July 16, 1894 



