Vol. V No. 11 



June 4, 1915 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Feed E. Weight William R. Maxon Edson S. Babtih 



OBOPHTBICAL LABOBATOBT NATIONAL MtJBBXTU OXOLOGIOAI. BUBVXT 



PUBLISHED SEMI-MONTHLl 

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



BTTHE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



