Vol. VIII No. 5 



Makch 4, 1918 



JOUENAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitcbcock J, Fhanklin Metee 



OEOLOaiCAL SUBTET BITBBAU OF FT.AMT INDUSIBT BUBEAU 'OF BTAKDABDS 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST, AND SEPTEMBER, WHBN MONTHLT 



BY THE 



WASHINGTON ACADEMY OP SCIENCES 



OFFICE OF PUBLICATION 



•WILLIAMS A WILKIN8 COMPANY 



BALTIMORE, MD. 



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



July 16. 1894 



