Vol. II. No. 13. 



July 19, 1912. 



' JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES ' 



BOARD OF EDITORS 

 George K. Burgess Frederick Leslie Ransome Carl S. Scofield 



BUREAU OP STANDARDS GEOLOGICAL SUHVET 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, 



