Vol. VII No. 17 



October 19, 1917 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 N. Ernest Dorset Adolph Knopf A. S. Hitchcock 



BUREAU OF STANDARD* nr"! OC-TOAI SURVEY • BUREAU OF PLANT INDUSTRY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST. AND EEPTEMBER. WHEN MONTHLY 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 

 WILLIAMS & WILKINS COMPANY 

 "BALTIMORE, MD. 



Entered as second-class matter Jtdy 14. 1911, at the post office at Baltimore, Maryland, under the Act i 



July 16. 1894 



