Vol. V No. 4 



February 19, 1915 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

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



aKOPBTSICAL LABOBATOBT NATIONAL MUSEUM QEOLOGICAI, SUBVET 



PUBLISHED SEMI-MONTHLY 

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



■ BT THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OP publication 



THE WAVERLY PRESS 



BALTIMORE, MD. 



