» Vou. 13 January 4,~1923 . No. 1 
JOURNAL 
OF THE 
WASHINGTON ACADEMY 
OF SCIENCES 
BOARD OF EDITORS 
S. F. Buaxs SIpNEY PAIGE E. D. WiLttamMson 
BUREAU OF PLANT INDUSTRY 5 GEOLOGICAL SURVBY z GEOPHYSICAL LABORATORY 
ASSOCIATE EDITORS 
H. V. Harban \ S. A. Ronwir 
_ BOTANICAL SOCIETY ENTOMOLOGICAL SOCIETY 
N. Ho.uister G. W. Strosr 
BIOLOGICAL SOCIETY GEOLOGICAL SOCIETY 
W, EF. Meacecers 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. 
Entered as Second Clees Matter, January 4, 1928, at the.post-office at Baltimore, Md., under the 
Act of Aveust 24,1912. Acceptance for mailirg at special rate of postage provided for 
in fection 1163, Act of October 3. 1917. Authorized on July 3, 1918. 
