Vol. io October 4, 1920 No. 16 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 



J. PRAHKUM MBTBX ROBBKT B. SoBMAX S. P BI.AX8 



BDKKAU or aTAllDASM OBorHTMGAI, LABOSATOHT BDRBAC OF PLANT DiODSTKT 



ASSOCIATE EDITORS 



H. V. HAKI.AM S A. ROHWBK 



BOTAHICAI. aOCXSTT SNTOMOUKIICAL BOCISTT 



N. HOLLISTBR F. B. SlIvSBBE 



BIOLOaiCAL aOCnTT PHILOSOPHICAL BOCUTT 



SiDNBT PAIGS J. R S wanton 



OSOLOOICAL BOCUTT AMTHBOPOLOOtCAL BOCtBTT 



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Bntcffcd aa Sec«nd Claa* Matter, Jannary 25, 1919. at the poat-ofiSce at Eaatim, Pa.. oBdar th« 

 Act of AHgntt 24, 1912. Acceptance for mailing at ipecUl rate »f p«atag« prsrided far ia 

 Section 1103 Act of October 3, 1917. Authorise/1 on Tulr 3. 1918 



