Vol. VI No. 9 



May 4, 1916 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 William R. Maxon Edsox S. Babtin N. Ernest Dorset 



RATIO* AL MUSEUM GEOLOGICAL SCKVKT BCBKAU or STAJTDABM 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST. AND SEPTEMBER, WHEN MONTHLY 



E.T THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE of publication 



WILLIAMS A WILKIN'S COMPANY 

 BALTIMORE. MB. 



Entered aa seoond-ciaas matter July M. 1911. at the post office at Baltimore, Maryland, under the Act at 



July 16. 1894 



