JOURNAL — 
WASHINGTON ACADEMY 
OF SCIENCES 
VOLUME 13, 1923 
BOARD OF EDITORS 
SIDNEY PAIGE E. D. WILLIAMSON d age) bevel Srnnaoane 
GEOLOGICAL SURVEY GEOPHYSICAL LABORATORY NATIONAL MUSEUM 
ASSOCIATE EDITORS 
H. V. HarRLan S. A. RonwER 
BOTANICAL SOCIETY ENTOMOLOGICAL SOCIETY 
N. HouuisTER G. W. StTosE 
BIOLOGICAL SOCIETY GEOLOGICAL SOCIETY 
W. F. Mreccers J. R. Swanton 
PHILOSOPHICAL SOCIETY ANTHROPOLOGICAL SOCIETY 
PUBLISHED SEMI-MONTHLY 
EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 
BY THE 
WASHINGTON ACADEMY OF SCIENCES 
WILLIAMS & WILKINS COMPANY 
BALTIMORE, MD., U. S&S. A. 
