Vol. V . No, 14 



August 19, 1915 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

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



3E10PHYBICAL LABORATOBT .NATIONAL MtjSETJM OBOLOGICAL SUBVHT 



PUBLISHED SEMI-MONTHLY 

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



BT THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



THE WAVERLY PRESS 



BALTIMORE, MD. 



