Voiv. lo February 19, 1920 No. 4 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. Frankiin Meyer Robert B. Sosman Alexander Wbtmorb 



BDKSAO OP STANDARDS OEOPHTSICAL LABOKATOKV BIOLOGICAL SURVEY 



ASSOCIATE EDITORS 



H. V. Harlan S. A. Rohwbr 



BOTANICAL SOCISTY BNTOMOLOGICAI, lOCISTT 



N. HOLLISTER F. B. SaSBEE 



BIOLOGICAL SOCIBTY PHILOSOPHICAL SOCISTY 



Sidney Paige J. R. Swanton 



OBOLOOICAL SOCISTY ANTHROPOLOGICAL SOCISTY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN Jin.Y, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY THB 



WASHINGTON ACADEMY OF SCIENCES 



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Entered as Second Class Matter, January 25, 1919, at the post-office at Easton, Pa., under the 

 Act of August 24. 1912. Acceptance for mailing at special rate of postage proTided for in 

 Section 1 103 Act of October 3. 1917, Authorised on July 3, 1918 



