Vol. III. No. 21 



December 10, 1913. 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofield Fred. Eugene Wright 



GEOLOQICAI/ SURVEY BUREAU OF PLANT 1NDU8TBX. ^ GEOPHYSICAL LABORATORY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY, 



BV THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY press 



BALTIMORE, MD. 



