﻿Vol. 
  12 
  April 
  4, 
  1922 
  No. 
  7 
  

  

  JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

   OF 
  SCIENCES 
  

  

  BOARD 
  OF 
  EDITORS 
  

   S. 
  P. 
  Bi«AKB 
  SiDNBT 
  Paiob 
  B. 
  D. 
  Wiu,iauson 
  

  

  BURBAO 
  or 
  K.ANT 
  IMOUSTKT 
  OSO(,OOICAI, 
  SDSTSV 
  OaOPBTaiCAI, 
  LABORATOST 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Harlam 
  S. 
  a. 
  Rohwsb 
  

  

  BOTAinCAL 
  aOCIKTT 
  ■MTOMOLOOICAL 
  aOCmTT 
  

  

  N. 
  HOLUSTBR 
  G. 
  W. 
  Stoss 
  

  

  BIOLOGICAL 
  90CIBTT 
  OlOLOOICAb 
  ■OCIBTT 
  

  

  W. 
  P. 
  MBG08KS 
  J. 
  R. 
  SWAMTOM 
  

  

  PKU.OSOVRICAL 
  aoCtSTV 
  AHTaBOPOLOOICAl, 
  MMiaTT 
  

  

  PUBUSHBD 
  SSMI-MONTHLT 
  

   SXCSPT 
  IN 
  JXTLT, 
  A0O08T, 
  AND 
  SSPTBUBBK. 
  WHBN 
  UONTHLT 
  

  

  BT 
  TBI 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OPPICB 
  OF 
  PUBUCATION 
  

  

  211 
  CHURCH 
  STRBET 
  

  

  BASTON, 
  PA. 
  

  

  Entered 
  as 
  Second 
  Class 
  Matter, 
  January 
  26, 
  1919, 
  at 
  the 
  post-office 
  at 
  Eastoa, 
  P«., 
  under 
  the 
  

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

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

  

  