)L. V No, 13 



July 19, 1915 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

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



OPHTBICAL LABOBATOBT NATIOMAL MTreEtJM OBOLOOICAL BOBTBT 



PUBLISHED SEMI-MONTHLY 

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



BT THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE or PTJBLICATION 



THB WAVERLY PRESS 

 BALTIMORE, MD. 



