﻿Vol.. 
  12 
  

  

  December 
  4, 
  1922 
  

  

  No. 
  20 
  

  

  JOURNAL 
  

  

  OP 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

   OF 
  SCIENCES 
  

  

  S. 
  F. 
  Blake 
  

  

  BrRBAD 
  or 
  PLANT 
  INDUSTRY 
  

  

  BOARD 
  OF 
  EDITORS 
  

   Sidney 
  Paige 
  

  

  OBOLOOICAL 
  SURVEY 
  

  

  E. 
  D. 
  WlLUAMtON 
  

  

  OaOPRYSICAI. 
  LABOKATOKT 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Harlan 
  

  

  BOTANICAL 
  SOCIETY 
  

  

  N. 
  HOLLISTER 
  

  

  BIOLOGICAL, 
  SOCIETY 
  

  

  W. 
  F. 
  Meggers 
  

  

  PHILOSOPHICAL 
  SOCIETY 
  

  

  S. 
  A. 
  ROHWER 
  

  

  ENTOHOLOQICAL 
  SOCIETY 
  

  

  G. 
  W. 
  ST09E 
  

  

  OBOLOOICAL 
  SOCIETY 
  

  

  J. 
  R. 
  Swanton 
  

  

  ANTBSOPOLOOICAL 
  30CIETV 
  

  

  PUBLISHED 
  SBMI-MONTHLY 
  

   EXCEPT 
  IN 
  JULY, 
  AUGUST, 
  AND 
  SEPTEMBER, 
  WHEN 
  MONTHLY 
  

  

  BY 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OFFICE 
  OF 
  PUBLICATION 
  

  

  211 
  CHURCH 
  STREET 
  

  

  EASTON, 
  Pa. 
  

  

  Entered 
  as 
  Secoud 
  Class 
  Matter, 
  January 
  25, 
  1919, 
  at 
  the 
  post-office 
  at 
  Eastoo, 
  Pa., 
  under 
  thi 
  

  

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

  

  in 
  Section 
  1103. 
  .Act 
  of 
  October 
  3, 
  1917. 
  Authorized 
  on 
  July 
  3, 
  1918. 
  

  

  