Vol. io September 19, i9»o No. 15 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. pRAMsxiM Mbtbx Robbit B. Sosmam S. F. Blakb 



BCKBAO or •VAJIDAKDa OBOPBTHCAI. I^SOKATOKT BDSBAD OP PLANT INDUSTHY 



ASSOCIATE EDITORS 



H. V. Hamsjlk S. a. Rohwbr 



BOTAMICAI. ■OCnTT SNTOlfOMMHCAL BOCISTT 



N. HOLUSTBR F. B. SiLSBBB 



BtOLOOICAI, ■OCI8TT PBILOSOPBieAl, SOCnTT 



Sidney Paigb J. R Swanton 



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Bntcred aa SmbbiI ClaM Matter, January 25, 1919. at the po«t-ofiSec at Eaatoa. Pa., aadar the 

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