Vol. V No, 2 



January 19, 1915 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Carl S. Scofield Fred, Eugene Wright William R. Maxon 



BUREAU OF PLANT INDUSTBT OEOPHTSICAL LABOBATOBT NATIONAL MUBE CM 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST. AND SEPTEMBER. WHEN MONTHLYo 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



