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Vol. 13 August 19} 1923; No. 14 
JOURNAL 
OF THE 
WASHINGTON ACADEMY 
OF SCIENCES 
> BOARD OF EDITORS 
Srpnzny Paras E. D. Wint1amMson E. P. Kru 
GEOLOGICAL SURVEY GEOPHYSICAL LABORATORY NATIONAL MUSEUM 
ASSOCIATE EDITORS 
H. V. Haran 5S. A. RonweEr 
BOTANICAL SOCIETY ENTOMOLOGICAL SOCIETY 
N. Hotuistser G. W. Stross 
BIOLOGICAL SOCIETY GEOLOGICAL SOCIETY 
W. F. Meaaers 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.A. 
a 
’ Entered as Second Class Matter, January 11, 1923, at the post-office at Baltimore, Md., under the 
Act of August 24,1912. Acceptance for mailing at special rate of postage provided for 
in Section 1103, Act of October 3, 1917. Authorized on July 3, 1918. 
