﻿CONTENTS. 
  

  

  Page. 
  

  

  Introduction 
  7 
  

  

  Means 
  by 
  which 
  insects 
  are 
  spread 
  7 
  

  

  Investigations 
  of 
  the 
  dispersion 
  of 
  the 
  gipsy 
  moth 
  8 
  

  

  Control 
  work 
  abandoned 
  9 
  

  

  Gipsy-moth 
  work 
  resumed 
  10 
  

  

  The 
  automobile 
  as 
  a 
  means 
  of 
  dispersing 
  the 
  gipsy 
  moth 
  11 
  

  

  Other 
  means 
  of 
  dispersing 
  the 
  gipsy 
  moth 
  11 
  

  

  Relation 
  of 
  birds 
  to 
  the 
  dispersion 
  of 
  the 
  gipsy 
  moth 
  12 
  

  

  Continued 
  dispersion 
  of 
  the 
  species 
  unexplained 
  15 
  

  

  Suggestions 
  concerning 
  the 
  spread 
  of 
  larvse 
  by 
  the 
  wind 
  16 
  

  

  Experimental 
  work 
  16 
  

  

  Experiments 
  at 
  Lincoln, 
  Mass 
  17 
  

  

  Experiments 
  in 
  Lynn 
  Woods, 
  Mass 
  18 
  

  

  Experiments 
  at 
  Cliftondale, 
  Mass 
  19 
  

  

  Experiments 
  on 
  Lynn 
  Marshes, 
  Mass 
  20 
  

  

  Quantity 
  of 
  silk 
  produced 
  by 
  first-stage 
  gipsy-moth 
  larvae 
  23 
  

  

  Relation 
  of 
  temperature 
  to 
  hatching 
  of 
  eggs 
  24 
  

  

  Effect 
  of 
  temperature 
  on 
  activity 
  of 
  larvae 
  25 
  

  

  Laboratory 
  experiments 
  27 
  

  

  Field 
  observations 
  28 
  

  

  Relation 
  of 
  activity 
  to 
  the 
  spinning 
  of 
  silk 
  28 
  

  

  Locations 
  where 
  egg 
  clusters 
  are 
  deposited 
  28 
  

  

  Distance 
  first-stage 
  larvae 
  can 
  crawl 
  29 
  

  

  Degree 
  of 
  infestation 
  30 
  

  

  Kinds 
  of 
  food 
  plants 
  30 
  

  

  Condition 
  of 
  food 
  plants 
  31 
  

  

  Direction 
  and 
  velocity 
  of 
  the 
  wind 
  31 
  

  

  General 
  summary 
  41 
  

  

  General 
  conclusions 
  41 
  

  

  Relation 
  of 
  scouting 
  records 
  to 
  wind 
  dispersion 
  42 
  

  

  Records 
  of 
  dispersion 
  of 
  the 
  gipsy 
  moth 
  secured 
  from 
  reports 
  of 
  scouting 
  in 
  

  

  several 
  selected 
  cities 
  42 
  

  

  Records 
  of 
  dispersion 
  secured 
  from 
  several 
  selected 
  towns 
  45 
  

  

  Plans 
  for 
  scouting 
  woodland 
  areas 
  50 
  

  

  Record 
  of 
  scouting 
  in 
  Lisbon, 
  Me 
  51 
  

  

  Record 
  of 
  scouting 
  in 
  Yarmouth, 
  Me 
  53 
  

  

  Record 
  of 
  scouting 
  in 
  Milton. 
  N. 
  II 
  53 
  

  

  Record 
  of 
  scouting 
  in 
  Tilton, 
  \. 
  II 
  54 
  

  

  Record 
  of 
  scouting 
  in 
  Bennington, 
  X. 
  II 
  54 
  

  

  Record 
  of 
  scouting 
  in 
  Gardner, 
  Mass 
  55 
  

  

  Record 
  of 
  scoul 
  bag 
  in 
  Grafton, 
  Mass 
  66 
  

  

  Record 
  of 
  scouting 
  in 
  Wareham, 
  Mass 
  57 
  

  

  Results 
  of 
  scoul 
  ing 
  woodland 
  areas 
  

  

  Effecl 
  of 
  wind 
  Bpread 
  on 
  the 
  problem 
  of 
  gipsy-moth 
  control 
  60 
  

  

  Summary 
  60 
  

  

  Recommendations 
  <>L 
  

  

  5 
  

  

  