Vol. III. - No. 20 



December 4, 1913. 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



, BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofibld Fred. Eugene Wright 



QBOLOaiCAL SURVKT BUBBAU OF PLANT INOUSTBT GEOPHTSICAL LABOBATOBT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER, WHEN MONTHLY, 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OP PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



