﻿Vol. 
  12 
  April 
  19, 
  1922 
  No. 
  8 
  

  

  JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

   OF 
  SCIENCES 
  

  

  BOARD 
  OF 
  EDITORS 
  

   S. 
  P. 
  Blaks 
  Sidn9t 
  Paigs 
  E. 
  D. 
  Wiixiamson 
  

  

  BDRBAO 
  0» 
  FbAVT 
  UfDUSTKT 
  OaoUMICAL 
  SOSVST 
  aaOVBTSICAI, 
  LABOa4TOKT 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Hari^m 
  S. 
  a. 
  Rohwbr 
  

  

  BOTAmCAl 
  aoCIBTT 
  ENTOMOI,OGICAL 
  SOCI8TY 
  

  

  N. 
  HOIXISTBS 
  G. 
  W. 
  ST088 
  

  

  BIOLOOICAt 
  SOaSTT 
  GSOLOGICAi; 
  SOCISTy 
  

  

  W. 
  p. 
  Mbgobrs 
  J. 
  R. 
  Swamton 
  

  

  nmOSOraiCAI, 
  lOCtaTT 
  ANTHROPOLOOrCAt 
  socibty 
  

  

  PUBU8HBO 
  SBMI-HONTHLT 
  

   SXCBPT 
  IN 
  JXTLY. 
  AUOUST, 
  AND 
  SBPTBICBSR, 
  WHKN 
  MONTHLY 
  

  

  BT 
  TRB 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OFFICB 
  OP 
  P0BUCATION 
  

  

  211 
  CHURCH 
  STREET 
  

  

  BASTON, 
  PA. 
  

  

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

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

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

  

  