Vol. II. No. 11. 



June 4, 1912. 



JOUKNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 George K. Burgess Frederick Leslie Ransome Carl S. Scofield 



BUREAU OF STANDARDS GEOLOGICAL SURVEY . -BUREAU OF PLANT INDUSTRY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY, 



BY THE 



/ 



WASHINGTON ACADEMY OF SCIENCES 



office of publication 



the waverly press 



baltimore, md. 



