Vol. III. ^ No. 16. 



October 4, 1913. 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OK SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofikld Fred. Eugene Wright 



OBOLOQICAL SURVEY ' BURBAC OF PLANT INDU8TRT OEOPHT8I0AL LABORATOBT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER. WHEN MONTHLY. 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



•THE WAVERLY press 



BALTIMORE, MD. 



