Voiv. lo NovKMBRR 4, 1920 No. 18 



JOURNAL 



OP THS 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. Pramki.]:n Mbtsx Robsbt B. Sosmam S. P- Bi.aks 



BtJBBAC OV •TAMDAXD* OBOPBTBICAL LABOKATOIT BCKBAU OF PLANT IMDOBTBT 



ASSOCIATE EDITORS 



H. V. Haslam S. a. Rohwsr 



BOTAHICAI. BOCiaTT MMTOKOUKIICAI, BOCSMTT 



N. H0U.ISTBR P. B. S1L8BBB 



aiOLOOICAL ■OCtBTT PKtI.OSOrMICAt, SOCnTT 



SiDNBT PaIGB ' J. R. SWANTOM 



QMOLOOICAL BOCIBTT AMTHBOPOLOOICAL BOCtBYT 



PTTBLISHBD SBm-MOIfTHLT 

 BZCBPT m JULY, AUGUST, AND SBPTBMBBR, WHBN UONTHLT 



BT THB 



WASHINGTON ACADEMY OF SCIENCES 

 omricB or pimLicATioN 



an CHURCH STRB8T 

 BASTON, PA. 



EoUred at Second dua Matter, Jannary 2S, 1919, at the poat-effiee at BaatMi. Fa., aader the 

 Act »t Angaft 24, 1912. Acceptance for mailing at ipceUl rate mt pMtagc pravlded far ia 

 SectloB 1103 Act of October 3, 1917. AalbBriscd ob Jmly 3, 191t 



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