Vol. III. No. 3, 



February 4, 1913. 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofibld Fred. Eugene Wright 



OBOLOQICAIj SI7BVBT BUREAU OF PLANT INDUSTRT GE0PHT8ICAL LABORATORY 



PUBLISHED SEMI-MONTHLY 



EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY, 



WASHINGTON ACADEMY OF SCIENCES 



office op PtTBLICATION 



THE WAVERLY press 



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