Vol. io Mat 19, 1930 No. 10 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. Franklin Mbybk Robbbt B. Sosman Aucxandbk Wstmoks 



■ niBAO or BTAMDABIM OBOPHTBTCAL LABOKATOKT BIOLOGICAL BOBTBT 



ASSOCIATE EDITORS 



H. V. Haklan S. a. Rohwbr 



BOTAHICAL SOCUTT BMTOlfOLOOICAL BOCniT* 



N. HOLUSTBR F. B. SaSBEE 



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Botored •• Second Claa* Matter, January 25, 1919. at the post-oflSce at Eoaton, Pa., uodor the 

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