JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



VOLUME IX, 1919 



BOARD OF EDITORvS 

 A. S. Hitchcock J. Franklin Meyer Robert B. Sosman 



BUREAU OF PLANT INDUSTRY BUREAU OF STAT^DARDS GEOPHYSICAL LABORATORY 



ASSOCIATE EDITORS 

 H, V. Harlan Sidney Paige 



BOTANICAL SOCISTY OSOLOOtCAI, SOCIBTV 



N= HOLLISTER S. A. ROHWER 



BIOLOGICAL SOCIBTY BNTOHOLOGICAL SOCIBTV 



E. C. McKelvy F. B. SilsbeE 



CBBMICAL SOCIBTV PHILOSOPHICAL SOCIBTV 



J. R. SWANTON 



ANTHROPOLOGICAL SOCIBTY 



PUBLISHED SBMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



211 CHURCH STREET 



EASTON, PA 



