Vol. VI No. 14 



August 19, 1916 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

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



M ATIOHAL MTJ8BDW GEOLOGICAL BUBVBT BCRKAO OF BTAKDiBM 



PUBLISHED SEMI- MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BT TBI 



WASHINGTON ACADEMY OF SCIENCES 



office of publication 



williams & wilkins compant 



baltimore, md. 



Entered aa second-class matter July 14. 1011, at the post office at Baltimore. Maryland, under the Act of 



July 16. 1394 



