Vol. III. No. 8. 



April 19, 1913. 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofield Fred. Eugene Wright 



QBOLOaiCAL 90RVBT BURBATJ OF PLANT INDCTSTRT QBOPHTSICAL LABORATORT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY, 



WASHINGTON ACADEMY OF SCIENCES 



/ 



OFFICE OF PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



