Vol. V No. 15 



September 19, 1915 



JOUKNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Fred. E. Wright William R. Maxon Eoson S. Bastin 



BBOPHTBICAL LABORATORT NATIONAL MX;SEUM OXOLOQICAL 8T7BVBT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST, AND SEPTEMBER. WHEN MONTHLY. 



BY TBX 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OP PtJBLICATION 



THE ■WAVEKLY PRESS 



BALTIMORE, MD. 



