Vol*. 9 June 4, 1919 No. 11 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 



A, S. Hitchcock J. Franki^in Meyer R. B. Sosman 



^URBAD OF PLANT IMDDSTRY BUREAU OF STANDARDS GBOPBYSICAL LABORATORY 



• ASSOCIATE EDITORS 



H. V. Harlan Sidney Paigb 



BOTANICAL SOCIBTY GBOLOOICAL SOCIBTY 



N. Holuster S. a. Rohwer 



BIOLOGICAL SOCIBTY BNTOHOLOOICAL SOCIBTY 



E. C. McKelvy F. B. Silsbee ; 



CHBIUCAL SOCIBTY PHILOSOPHICAL SOCIBTY 



J. R. SWANTON 



ANTHROPOLOOICAL SOCIBTY 



PUBLISHED SBMI-MONTHLY 

 EXCEPT IN JtJLY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY TH8 



WASHINGTON ACADEMY OF SCIENCES 



OPWCE OP PUBLICATION 



211 CHURCH STREET 



EASTON, PA. 



Entered aa Second Class Matter, January 25, 1919. at the post-ofiSce at Easton, Pa., 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 on July 3, 1918 



