Vol. III. No. 6. 



March 19, 1913. 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofield Fbed. Eugene Wright 



OGOLOOICAL SUBVBT BURBAU OP PLANT INOaSTRT QBOPHTMCAI, LABOBATOBT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY. 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY press 



BALTIMCIUB, MD. 



