﻿EXPERIMENTS 
  ON 
  LYNX 
  MARSHES, 
  MASS. 
  21 
  

  

  covered 
  with 
  tanglefoot 
  and 
  were 
  placed 
  in 
  the 
  direction 
  toward 
  

   which 
  the 
  wind 
  was 
  blowing, 
  the 
  idea 
  being 
  that 
  if 
  the 
  caterpillars 
  

   were 
  blown 
  from 
  the 
  box 
  which 
  was 
  set 
  up 
  at 
  the 
  central 
  station, 
  speci- 
  

   mens 
  might 
  be 
  caught 
  on 
  the 
  screens. 
  Owing 
  to 
  the 
  variability 
  of 
  the 
  

   air 
  currents 
  and 
  the 
  continued 
  changes 
  in 
  the 
  direction 
  of 
  the 
  wind 
  

   it 
  was 
  found 
  better 
  to 
  use 
  three 
  screens, 
  which 
  were 
  set 
  up 
  at 
  distances 
  

   ranging 
  from 
  50 
  to 
  several 
  hundred 
  feet 
  from 
  each 
  other, 
  but 
  all 
  at 
  

   an 
  equal 
  distance 
  from 
  a 
  central 
  station. 
  On 
  May 
  0> 
  a 
  single 
  screen 
  

   was 
  set 
  up 
  50 
  feet 
  from 
  the 
  central 
  station. 
  The 
  wind 
  was 
  light 
  and 
  

   variable, 
  but 
  10 
  minutes 
  after 
  it 
  had 
  been 
  placed 
  in 
  position 
  a 
  cater- 
  

   pillar 
  was 
  caught. 
  At 
  the 
  expiration 
  of 
  an 
  hour 
  five 
  caterpillars 
  

   were 
  found 
  on 
  the 
  screen. 
  

  

  It 
  was 
  then 
  set 
  up 
  100 
  feet 
  from 
  the 
  central 
  station. 
  Four 
  cater- 
  

   pillars 
  were 
  caught 
  in 
  a 
  short 
  time. 
  On 
  the 
  following 
  day 
  two 
  extra 
  

   screens 
  were 
  made 
  in 
  order 
  to 
  provide 
  for 
  changes 
  in 
  the 
  direction 
  of 
  

   the 
  wind. 
  During 
  the 
  day 
  two 
  caterpillars 
  were 
  caught 
  at 
  150 
  feet, 
  

   two 
  at 
  200 
  feet, 
  one 
  at 
  250 
  feet, 
  and 
  one 
  at 
  300 
  feet. 
  On 
  May 
  10 
  one 
  

   caterpillar 
  was 
  caught 
  at 
  a 
  distance 
  of 
  350 
  feet 
  from 
  the 
  central 
  

   station, 
  after 
  the 
  screen 
  had 
  been 
  exposed 
  for 
  3-J 
  hours. 
  On 
  May 
  11 
  

   one 
  caterpillar 
  was 
  caught 
  500 
  feet 
  from 
  the 
  central 
  station, 
  after 
  

   this 
  screen 
  had 
  been 
  exposed 
  for 
  about 
  an 
  hour. 
  The 
  screens 
  Avere 
  

   then 
  put 
  up 
  GOO 
  feet 
  from 
  the 
  station, 
  and 
  30 
  minutes 
  later 
  two 
  

   caterpillars 
  had 
  been 
  caught. 
  Two 
  of 
  the 
  screens 
  were 
  then 
  set 
  up 
  

   TOO 
  feet 
  from 
  the 
  station 
  and 
  remained 
  there 
  until 
  late 
  in 
  the 
  after- 
  

   noon. 
  Before 
  leaving 
  for 
  the 
  night 
  the 
  remaining 
  screen 
  was 
  set 
  up 
  

   in 
  the 
  direction 
  of 
  the 
  prevailing 
  wind 
  and 
  at 
  a 
  distance, 
  which 
  later 
  

   proved 
  to 
  be 
  1.833 
  feet, 
  from 
  the 
  central 
  station. 
  On 
  the 
  following 
  

   morning 
  a 
  caterpillar 
  was 
  found 
  on 
  the 
  last-mentioned 
  screen. 
  The 
  

   supply 
  of 
  first-stage 
  caterpillars 
  being 
  practically 
  exhausted 
  on 
  this 
  

   date, 
  we 
  were 
  obliged 
  to 
  discontinue 
  these 
  experiments, 
  but 
  the 
  screens 
  

   were 
  removed 
  to 
  another 
  point 
  on 
  the 
  marsh 
  and 
  set 
  up 
  at 
  measured 
  

   distances 
  of 
  one-fourth 
  mile. 
  1.800 
  feet, 
  2,300 
  feet, 
  and 
  2,800 
  feet 
  

   north 
  of 
  Oak 
  Island. 
  Revere. 
  Mass. 
  This 
  is 
  a 
  wooded 
  island 
  (PI. 
  X) 
  

   of 
  several 
  acres 
  surrounded 
  by 
  salt 
  marsh; 
  the 
  trees 
  are 
  generally 
  

   infested 
  with 
  the 
  gipsy 
  moth, 
  and 
  owing 
  to 
  its 
  proximity 
  to 
  the 
  ocean 
  

   the 
  growth 
  of 
  the 
  larvae 
  is 
  considerably 
  retarded. 
  It 
  was 
  hoped 
  that 
  

   evidence 
  might 
  be 
  secured 
  that 
  caterpillars 
  were 
  carried 
  by 
  the 
  wind 
  

   from 
  this 
  locality, 
  but 
  no 
  larvae 
  were 
  caught 
  on 
  the 
  screen-, 
  although 
  

   they 
  remained 
  in 
  position 
  until 
  June 
  L3. 
  

  

  In 
  connection 
  with 
  these 
  experiments 
  it 
  should 
  be 
  said 
  that 
  prac- 
  

   tically 
  the 
  whole 
  of 
  this 
  salt-marsh 
  area 
  (PI. 
  IX) 
  is 
  flooded 
  at 
  high 
  

   tide: 
  hence 
  it 
  was 
  possible 
  to 
  carry 
  on 
  the 
  experiments 
  during 
  only 
  a 
  

   pari 
  of 
  the 
  day. 
  The 
  weather 
  dining 
  April 
  was 
  cool, 
  which 
  is 
  usually 
  

   the 
  case 
  in 
  this 
  region 
  near 
  the 
  seacoast, 
  where 
  (lie 
  land 
  is 
  flat 
  ami 
  

   exposed 
  to 
  strong 
  air 
  currents. 
  The 
  gipsy-moth 
  caterpillars 
  are 
  not 
  

  

  