Vol,. 9 October 19, 1919 No. 17 



JOURNAL 



OF THIC 



WASHINGTON ACADEMY 

 OF SCIENCES . 



BOARD OF EDITORS 

 A. S. Hitchcock J. Franklin Meyer R. B. Sosman 



BDKBAU OF PLANT INDUSTRY BCRBAU OP STANDARDS GSOPRVSICAL LABOKATORT 



ASSOCIATE EDITORS 

 H. V. Harlan Sidney Paige 



BOTANICAL SOCIBTY GBOLOOICAL loCIBTY 



N. HOLUSTER S. A. ROHWER 



BIOLOGICAL SOCIBTY BNTOHOLOGICAL aoCISTY 



E. C. McKelvy F. B. SasBBE 



CBSMICAL SOCIBTY PHILOSOPHICAL aociBTV 



J. R. SWANTON 



ANTHROPOLOGICAL SOCIBTY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY THB 



WASHINGTON ACADEMY OF SCIENCES 



OFPICE oy PUBLICATION 



211 CHUJICH STREET 



EASTON, PA. 



Entered as Second Class Matter, January 25, 1919. at the post-ofiSce at Easton, P«., under the 

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

 .Section 1 103, Act of October 3, 1917, Authorized ou July 3. 1918 



