﻿XXXV 
  

  

  3Iay 
  18, 
  1919, 
  6.40 
  p.m.— 
  Gently 
  feeding 
  on 
  the 
  leaf 
  with 
  

   which 
  its 
  head 
  was 
  in 
  contact 
  in 
  the 
  day 
  position. 
  10.45 
  p.m., 
  

   had 
  moved 
  to 
  a 
  different 
  part 
  of 
  the 
  stem, 
  the 
  head 
  now 
  to- 
  

   wards 
  the 
  base 
  of 
  the 
  twig 
  instead 
  of 
  towards 
  the 
  tip 
  — 
  the 
  

   invariable 
  position 
  when 
  observed 
  by 
  day. 
  

  

  May 
  19. 
  — 
  Morning 
  : 
  resting 
  on 
  another 
  twig. 
  There 
  is 
  

   certainly 
  no 
  tendency 
  to 
  " 
  home 
  " 
  like 
  that 
  observed 
  in 
  

   limpets. 
  9.10 
  p.m., 
  day 
  position; 
  10.45, 
  crawling 
  about. 
  

  

  May 
  20. 
  — 
  Day 
  position 
  maintained 
  at 
  9.10 
  p.m. 
  (third 
  

   observation); 
  9.43, 
  eating 
  without 
  moving. 
  

  

  May 
  21. 
  — 
  Day 
  position 
  at 
  9.20 
  p.m. 
  (third 
  observation); 
  

   9.55, 
  eating 
  vigorously 
  in 
  new 
  position 
  and 
  with 
  back 
  curved. 
  

  

  May 
  23. 
  — 
  Day 
  position 
  at 
  9.30 
  p.m. 
  (third 
  observation) 
  ; 
  

   9.45, 
  moving 
  about 
  freely. 
  

  

  May 
  24:. 
  — 
  Taken 
  to 
  museum 
  to 
  be 
  photographed. 
  The 
  

   disturbance 
  caused 
  the 
  larva 
  to 
  alter 
  its 
  attitude, 
  and 
  when 
  

   the 
  twig 
  was 
  fixed 
  upright 
  in 
  front 
  of 
  the 
  camera, 
  it 
  waa 
  

   standing 
  out 
  at 
  right 
  angles 
  to 
  its 
  support. 
  Although 
  in 
  

   this 
  position 
  it 
  appeared 
  to 
  be 
  rigid, 
  close 
  inspection 
  showed 
  

   that 
  it 
  was 
  not 
  really 
  so 
  : 
  the 
  strain 
  was 
  too 
  great, 
  and 
  the 
  

   caterpillar 
  was 
  continually 
  making 
  rapid 
  movements 
  of 
  small 
  

   amplitude, 
  but 
  sufficient 
  to 
  prevent 
  the 
  taking 
  of 
  a 
  jjhoto- 
  

   graph. 
  When 
  its 
  head 
  was 
  gently 
  raised 
  and 
  supported 
  in 
  a 
  

   notch 
  cut 
  in 
  the 
  edge 
  of 
  a 
  leaf 
  the 
  larva 
  had 
  no 
  difficulty 
  in 
  

   maintaining 
  sufficient 
  rigidity, 
  although 
  minute 
  movements, 
  

   perhaps 
  caused 
  by 
  the 
  contraction 
  of 
  the 
  dorsal 
  vessel, 
  are 
  

   indicated 
  in 
  the 
  negative. 
  

  

  Cessation 
  of 
  feeding, 
  already 
  imminent, 
  was 
  perhaps 
  deter- 
  

   mined 
  at 
  this 
  date 
  by 
  the 
  disturbance. 
  When 
  the 
  sleeve 
  was 
  

   again 
  fixed 
  on 
  the 
  pear 
  tree 
  the 
  larva 
  went 
  to 
  the 
  living 
  twig 
  

   and 
  assumed 
  the 
  rigid 
  day 
  position, 
  still 
  maintained 
  at 
  

   9.17 
  p.m. 
  and 
  at 
  9.30, 
  although 
  at 
  this 
  time 
  a 
  thick 
  line 
  of 
  

   silk 
  was 
  first 
  observed 
  joining 
  the 
  head 
  to 
  a 
  leaf. 
  By 
  10 
  p.m. 
  

   the 
  fine 
  appeared 
  to 
  be 
  longer, 
  but 
  15 
  minutes 
  later 
  the 
  larva 
  

   was 
  walking 
  about. 
  

  

  May 
  25. 
  — 
  ^The 
  threads 
  observed 
  on 
  the 
  previous 
  day 
  were 
  

   probably 
  abortive 
  attempts 
  at 
  spinning, 
  for 
  on 
  this 
  evening 
  

   the 
  caterpillar 
  had 
  fixed 
  a 
  small 
  loose 
  leaf 
  to 
  stem, 
  suspending 
  

   it 
  by 
  a 
  silken 
  cable. 
  The 
  caterpillar, 
  close 
  beside 
  it, 
  also 
  

  

  