JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



^.7 



I/' * 



VOLUME VIII, 1918 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. Fraxklin Meyer 



GEOLOGICAL SURVEY BUREAU OF PLANT INDUSTRY BUREAU OF STANDARDS 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST, AND SEPTEMBER, WHEN MONTHLY, 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLT PRESS 



BALTIMORE, MD. 



