December 4, 1923 No. 20 
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JOURNAL 
OF THE 
_ WASHINGTON ACADEMY 
ce OF SCIENCES 
BOARD OF EDITORS 
Sipyey Paice | E. D. WILLIAMSON E. P. Kruuip 
GEOLOGICAL SURVEY GHOPHYSICAL LABORATORY NATIONAL MUSEUM 
aft : ASSOCIATEZEDITORS 
“Sy £ H. V. Haruan S. A. RoHwER 
si : “BOTANICAL SOCIETY ENTOMOLOGICAL SOCIETY 
% N. Houuister _  G. W. Srosp 
ro a ; j BIOLOGICAL SOCIETY : GEOLOGICAL SOCIETY 
yet) W. F. Meacerrs J. R. Swanton 
A Gaal ante Say PHILOSOPHICAL SOCIETY u ANTHROPOLOGICAL SOCIETY 
. 7 \ - - 
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