Voi,. II 



Fbbruary ig, 1921 



No. 4 



JOURNAL 



OP TBS 



WASHINGTON ACADEMY 

 OF SCIENCES 



ROBSKT B. SOSMAN 

 O^PHTSICAI, LABOSATOBT 



BOARD OF EDITORS 

 S. F. BtAKB 



BDRBAU OF PLANT IMDUSTRT 



SiDNBf PAIOB 

 OSOLOOICAI, 8UKVST 



ASSOCIATE EDITORS 



H. V. Hari^n 



BOTAMICAL SOCIBTV 



N, HOLUSTBR 



BIOLOOICAI, aOCIBTV 



S. A. ROHWBR 



BNTOMOI.OOICAI. SOCIBTV 



P. B. Sn^BBB 



PBILOSOPBICAI. SOCIBTV 



G. W. Stosb 



OBOLOOICAI. SOCIBTV 



J. R. SWANTON 



ANTBROPOI.OOICAI. SOCIBTV 



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 EXCEPT IN JUtY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY TBB 



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



Act ot 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, 



