﻿18 
  THE 
  DISPERSION 
  OF 
  THE 
  GIPSY 
  MOTH. 
  

  

  moderately 
  to 
  badly 
  infested 
  with 
  the 
  gipsy 
  moth, 
  and 
  it 
  was 
  ex- 
  

   pected 
  that 
  if 
  the 
  young 
  caterpillars 
  were 
  carried 
  by 
  air 
  currents 
  it 
  

   would 
  be 
  possible 
  to 
  secure 
  some 
  of 
  them 
  in 
  the 
  tanglefoot 
  which 
  

   was 
  applied 
  to 
  the 
  wire 
  netting. 
  The 
  pond 
  is 
  about 
  a 
  mile 
  and 
  a 
  half 
  

   long 
  and 
  three-fourths 
  of 
  a 
  mile 
  wide. 
  As 
  there 
  are 
  two 
  small 
  

   islands 
  on 
  which 
  brush 
  and 
  sprouts 
  were 
  growing 
  near 
  the 
  west 
  side, 
  

   an 
  attempt 
  was 
  made 
  to 
  anchor 
  the 
  raft 
  as 
  nearly 
  as 
  possible 
  at 
  a 
  

   point 
  midway 
  between 
  the 
  islands 
  and 
  the 
  opposite 
  shore. 
  The 
  raft 
  

   was 
  constructed 
  April 
  25, 
  1910, 
  and 
  an 
  attempt 
  was 
  then 
  made 
  to 
  

   anchor 
  it 
  in 
  the 
  center 
  of 
  the 
  pond. 
  Owing 
  to 
  the 
  high 
  wind 
  it 
  was 
  

   found 
  impossible 
  to 
  do 
  so, 
  therefore 
  it 
  was 
  anchored 
  near 
  one 
  of 
  the 
  

   small 
  islands, 
  where 
  it 
  remained 
  until 
  May 
  2, 
  when 
  the 
  anchorage 
  was 
  

   changed 
  to 
  the 
  center 
  of 
  the 
  pond. 
  On 
  this 
  date 
  the 
  screens 
  were 
  

   examined, 
  but 
  no 
  larva? 
  were 
  found 
  in 
  the 
  tanglefoot. 
  

  

  On 
  May 
  9 
  the 
  pond 
  was 
  visited, 
  and 
  it 
  was 
  found 
  that 
  the 
  raft 
  

   had 
  drifted 
  from 
  its 
  anchorage 
  to 
  the 
  shore 
  at 
  the 
  northeastern 
  end 
  

   of 
  the 
  pond. 
  Infested 
  woodland 
  was 
  present 
  within 
  200 
  yards 
  of 
  

   where 
  the 
  raft 
  lodged. 
  The 
  tanglefoot 
  was 
  examined, 
  but 
  no 
  cater- 
  

   pillars 
  were 
  found. 
  Owing 
  to 
  the 
  strong 
  wind 
  it 
  was 
  impossible 
  to 
  

   tow 
  the 
  raft 
  to 
  the 
  center 
  of 
  the 
  pond, 
  so 
  it 
  was 
  allowed 
  to 
  remain 
  

   where 
  it 
  was 
  found. 
  

  

  On 
  June 
  9 
  a 
  visit 
  was 
  made 
  to 
  this 
  trap 
  for 
  the 
  purpose 
  of 
  making 
  

   the 
  final 
  examination 
  and 
  dismantling 
  it. 
  A 
  single 
  caterpillar 
  was 
  

   found 
  in 
  the 
  tanglefoot, 
  which 
  proved 
  upon 
  a 
  careful 
  examination 
  

   to 
  be 
  a 
  first-stage 
  gipsy-moth 
  larva. 
  Owing 
  to 
  the 
  difficulty 
  of 
  thor- 
  

   oughly 
  examining 
  the 
  wire 
  screen, 
  because 
  some 
  of 
  the 
  tangle- 
  

   foot 
  had 
  become 
  rather 
  hard 
  and 
  also 
  because 
  of 
  the 
  presence 
  of 
  

   an 
  innumerable 
  number 
  of 
  Micro-Diptera 
  and 
  other 
  small 
  insects, 
  

   the 
  screen 
  was 
  taken 
  from 
  the 
  wooden 
  form 
  and 
  brought 
  to 
  the 
  

   laboratory, 
  where 
  later 
  in 
  the 
  season 
  it 
  was 
  cut 
  up 
  into 
  small 
  strips 
  

   and 
  thoroughly 
  examined. 
  This 
  work 
  was 
  done 
  by 
  Mr. 
  J. 
  V. 
  Schaff- 
  

   ner 
  and 
  Mr. 
  Emery 
  Proctor, 
  but 
  no 
  other 
  gipsy-moth 
  caterpillars 
  

   were 
  found 
  upon 
  it. 
  During 
  the 
  first 
  part 
  of 
  the 
  experiment 
  the 
  

   weather 
  was 
  cool, 
  which 
  probably 
  resulted 
  in 
  the 
  young 
  larvae 
  mov- 
  

   ing 
  about 
  but 
  little, 
  and 
  this 
  may 
  explain 
  why 
  more 
  caterpillars 
  

   were 
  not 
  caught 
  in 
  the 
  trap. 
  Attention 
  should 
  be 
  called 
  to 
  the 
  small 
  

   area 
  of 
  screen 
  which 
  was 
  exposed, 
  and 
  in 
  the 
  light 
  of 
  future 
  experi- 
  

   ments 
  it 
  dees 
  not 
  appear 
  strange 
  that 
  no 
  more 
  caterpillars 
  were 
  

   secured.. 
  

  

  EXPERIMENTS 
  IN 
  LYNN 
  WOODS, 
  MASS. 
  

  

  It 
  did 
  not 
  seem 
  practical, 
  however, 
  when 
  the 
  experiment 
  was 
  

   planned, 
  to 
  attempt 
  to 
  settle 
  the 
  question 
  by 
  making 
  one 
  test. 
  Several 
  

   other 
  screens 
  were 
  constructed, 
  and 
  one 
  made 
  in 
  a 
  similar 
  manner 
  

   to 
  the 
  one 
  used 
  on 
  the 
  raft 
  at 
  Lincoln 
  was 
  placed 
  on 
  top 
  of 
  an 
  obser- 
  

  

  