Von. 13 January 19, 1923 No. 2 
JOURNAL 
OF THE ; 
WASHINGTON ACADEMY 
OF SCIENCES 
BOARD OF EDITORS 
S. F. Buaxs Sipney Paige E. D. WittramMson 
BUREAU OF PLANT INDUSTRY GEOLOGICAL SURVEY GEOPHYSICAL LABORATORY 
ASSOCIATE EDITORS 
HH. V. Hartan S. A. RoHwrEr 
BOTANICAL SOCIETY ENTOMOLOGICAL SOCIETY 
N. Hoiuister G. W. Stross 
BIOLOGICAL SOCIETY GEOLOGICAL SOCIETY 
W. F. Msccrrs J. R. Swanton 
PHILOSOPHICAL se sod ANTHROPOLOGICAL SOCIETY 
PUBLISHED SEMI-MONTHLY 
EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 
BY THE 
WASHINGTON ACADEMY OF SCIENCES 
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WILLIAMS & WILKINS COMPANY 
BALTIMORE, MD., U.S.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. 
