Vol. VI No. 8 



April 19, 1916 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 



William R. Maxon Edson S. Baste* X. Ehnest Dosbxt 



x(Tii"<i'. ircvKvn cttolocicai. slhh; tcckxau or wturzss- « 



3USEED 3Zvi-M0:rTHLY 

 KXCKPT IN JULY, AUGUST. A.VZ SEPTEMBER. WHEN MONTHLY 



BT TSS 



WASHINGTON ACADEMY OF SCIENCES 



omcs or publication * 



WILLIAMS A WILKIN'S COMPANT 

 3ALTIMOSX. MS. 



Entered tu >«nd-ci.aas master July 14. 1911, at the poet o5ae at Baitiiaora, Maryland, uader tc< 



July 16. IS9* 



