Vol.. II March 19, 192 1 No. 6 



JOURNAL 



OF TH« 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 Robert B. Sosman S. F. Bmkb Sidney Paiob 



OSOPHVSICAI. tABORATORY BDRBAU OF PLANT INDOSTKV OSOLOOICAL BURVBV 



ASSOCIATE EDITORS 



H. V. Harlan F. B. SasBEE 



BOTANICAL SOCIBTT PHILOSOPHICAL SOCIBTV 



N. HOLLISTER G. W. STOSB 



BIOLOGICAL SOCIBTY OBOLOGICAL SOCIBTT 



S. A. ROHWER J- R. SWANTON 



ENTOMOLOGICAL SOCI8TV ANTHROPOLOGICAL SOCIBT* . 



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

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