Vol. V No. 8 



Apeil 19, 1915 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Fhbd. E. Wright Wiluam R. Max on Edson S. BAarm 



0»OPKT«CXL LABORA.TOBT KATIONAL MCBZUM QIOLOOIOAt. BURTBT 



PUBLISHED SEMI-MONTHLt 

 EXCEPT IN JULY. AUGUST. AND SEPTEMBER, WHEN MONTHLYo 



BT THE , 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OP PUBLICATION 



THE WAVEELY PRESS 



BALTIMORE^ MD. 



