Vol. VII No. 9 



Mat 4, 1917 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 



N. Ernest Dorset Adolph Knopf A. S. Hitchcock 



BUREAU OF BTANDABDfi GEOLOGICAL 8URYEY EUBEAU OF PLANT INDUSTRY 



\ 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 

 WILLIAMS & WILKINS COMPANY 



BALTIMORE, MD. I 



Entered cs second-clans matter July 14, 1911, at the post office at Baltimore, Maryland, under the Act of 



July 16, ,1884 



