﻿Dr. 
  H. 
  Eltringham 
  on 
  Butterfly 
  Vision. 
  49 
  

  

  In 
  the 
  preparation 
  of 
  the 
  foregoing 
  work 
  I 
  desire 
  to 
  ex- 
  

   press 
  my 
  sincere 
  thanks 
  to 
  Dr. 
  F. 
  A. 
  Dixey, 
  Mr. 
  E. 
  S. 
  Good- 
  

   rich, 
  Mr. 
  J. 
  Bronte 
  Gatenby, 
  Mr. 
  A. 
  H. 
  Hamm, 
  Professor 
  

   Poulton, 
  Lord 
  Rayleigh, 
  Commander 
  J. 
  J. 
  Walker, 
  and 
  

   others 
  who 
  have 
  kindly 
  helped 
  me 
  either 
  with 
  personal 
  

   assistance 
  or 
  useful 
  suggestions. 
  Professor 
  Poulton 
  has 
  

   specially 
  helped 
  me 
  by 
  kindly 
  reading 
  the 
  proofs. 
  

  

  I 
  have 
  not 
  given 
  a 
  bibUography 
  of 
  the 
  subject, 
  as 
  the 
  

   Uterature 
  is 
  so 
  voluminous 
  that 
  it 
  would 
  occupy 
  a 
  great 
  

   many 
  pages 
  of 
  our 
  Transactions, 
  and 
  economy 
  of 
  paper 
  

   is 
  still 
  a 
  necessity. 
  Those 
  specially 
  interested 
  will 
  find 
  

   bibhographies 
  in 
  nearly 
  all 
  the 
  works 
  I 
  have 
  mentioned 
  in 
  

   the 
  text. 
  

  

  TRANS. 
  ENT. 
  SOC. 
  LOND. 
  1919. 
  — 
  PARTS 
  I, 
  IT, 
  (jIILY) 
  E 
  

  

  