^ 



31 



Vol. II 



December 19, 1921 



No. 21 



JOURNAL 



OP THB 



WASHINGTON ACADEMY 

 OF SCIENCES 



Robert B. Sosman 



OBOFBVSICAL LABOSATOBT 



BOARD OF EDITORS 

 S. F. Blakb 



BDK8AIT OP PLANT mODSTBV 



SiDNBT PaIQB 

 asoLoorcAL sdsvst 



ASSOCIATE EDITORS 



H. V. Harlan 



BOTANICAL SOCIETY 



N. HOLUSTKR 



BIOLOGICAL SOCISTT 



S. A. ROHWBR 



BNTOMOLOOICAL 90CIBT* 



P. B. SiLSBBB 



PHILOSOPHICAL 80CIBTY 



G. W. STOSB 



GBOLOOICAL SOCIBTy 



J. R. SWANTON 



ANTBBOPOLOOICAI. SOCIBTy 



PUBUSHED SBMI-MONTHLT 

 EXCEPT IN JUtY. AUGUST AND SEPTBMBBR. WHEN MONTHLY 



BY THB 



WAvSHINGTON ACADEMY OF SCIENCES 



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2 1 1 CHURCH STREET 



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Bntered u Second CIa«» Matter, January 25, 1919, at the post-office at Ea»ton, P«., under tb» 



Act of August 24, 1912. Acceptance for mailing at special rate of postage provided for 



io Section 1103, Act of October 3, 1917. Authoriied on July 3. 1918. 



