﻿MASS. 
  17 
  

  

  it 
  was 
  very 
  difficult 
  to 
  determine 
  how 
  far 
  they 
  might 
  be 
  carried 
  

   under 
  such 
  conditions, 
  owing 
  to 
  the 
  small 
  size 
  of 
  the 
  rooms 
  where 
  

   the 
  experiment 
  was 
  tried, 
  it 
  was 
  possible 
  in 
  a 
  few 
  cases 
  to 
  secure 
  

   specimens 
  which 
  had 
  drifted 
  from 
  20 
  to 
  30 
  feet 
  from 
  the 
  fan. 
  This 
  

   led 
  to 
  an 
  attempt 
  to 
  test 
  the 
  matter 
  under 
  outdoor 
  conditions. 
  

  

  Arrangements 
  were 
  made 
  with 
  Mr. 
  L. 
  H. 
  Wbrthley, 
  then 
  assistant 
  

   forester 
  of 
  Massachusetts, 
  whereby 
  the 
  tests 
  would 
  be 
  made 
  coopera- 
  

   tively 
  with 
  the 
  department 
  which 
  he 
  represented. 
  Supplies 
  and 
  

   assistance 
  were 
  furnished 
  by 
  the 
  State, 
  and 
  several 
  men 
  employed 
  by 
  

   the 
  Bureau 
  of 
  Entomology 
  attended 
  to 
  certain 
  parts 
  of 
  the 
  work. 
  

   Many 
  valuable 
  suggestions 
  were 
  secured 
  from 
  Mr. 
  Worthley, 
  and 
  

   from 
  Messrs. 
  D. 
  M. 
  Rogers 
  and 
  W. 
  F. 
  Fiske 
  of 
  this 
  bureau. 
  In 
  carry- 
  

   ing 
  on 
  the 
  tests 
  especial 
  credit 
  is 
  due 
  to 
  Mr. 
  C. 
  W. 
  Collins, 
  who 
  

   assisted 
  in 
  many 
  of 
  the 
  experiments; 
  to 
  Messrs 
  E. 
  A. 
  Proctor, 
  J. 
  V. 
  

   Schatfner, 
  and 
  K. 
  W. 
  Brown 
  for 
  assistance 
  and 
  suggestions; 
  to 
  Mr. 
  

   H. 
  R. 
  Gooch, 
  who 
  constructed 
  the 
  screens 
  and 
  apparatus 
  used; 
  to 
  

   Messrs. 
  C. 
  W. 
  Stockwell, 
  F. 
  H. 
  Mosher, 
  and 
  John 
  E. 
  Dudley, 
  jr., 
  for 
  

   helpful 
  suggestions 
  and 
  for 
  recording 
  data 
  on 
  several 
  phases 
  of 
  the 
  

   work; 
  and 
  to 
  Messrs. 
  H. 
  S. 
  Barber, 
  Melvin 
  Guptill, 
  H. 
  A. 
  Preston, 
  

   and 
  W. 
  X. 
  Dovener, 
  who 
  prepared 
  the 
  photographs 
  and 
  accompany- 
  

   ing 
  illustrations. 
  Suggestions 
  which 
  had 
  a 
  practical 
  bearing 
  upon 
  

   the 
  tests 
  were 
  made 
  by 
  those 
  mentioned 
  and 
  by 
  many 
  others 
  con- 
  

   nected 
  with 
  the 
  work 
  at 
  the 
  parasite 
  laboratory, 
  so 
  that 
  all 
  have 
  

   contributed 
  to 
  the 
  results 
  which 
  will 
  be 
  given. 
  

  

  For 
  the 
  weather 
  conditions 
  in 
  Massachusetts 
  we 
  are 
  indebted 
  to 
  

   Mr. 
  J. 
  W. 
  Smith, 
  district 
  forecaster 
  of 
  the 
  Weather 
  Bureau, 
  United 
  

   States 
  Department 
  of 
  Agriculture, 
  at 
  the 
  Boston 
  office. 
  Data 
  have 
  

   also 
  been 
  secured 
  from 
  local 
  forecaster 
  Edward 
  P. 
  Jones, 
  at 
  Portland, 
  

   Me., 
  and 
  from 
  local 
  forecaster 
  E. 
  C. 
  Vose, 
  at 
  Concord, 
  X. 
  H., 
  who 
  

   have 
  very 
  courteously 
  allowed 
  the 
  records 
  of 
  their 
  offices 
  to 
  be 
  freely 
  

   used. 
  

  

  Plans 
  were 
  made 
  to 
  carry 
  on 
  several 
  experiments 
  out 
  of 
  doors 
  as 
  

   soon 
  as 
  the 
  caterpillars 
  began 
  to 
  hatch, 
  and 
  for 
  this 
  purpose 
  a 
  num- 
  

   ber 
  of 
  favorably 
  situated 
  localities 
  were 
  selected. 
  In 
  each 
  case 
  a 
  

   screen 
  of 
  galvanized-iron 
  wire 
  was 
  attached 
  to 
  a 
  wooden 
  frame, 
  and 
  

   after 
  the 
  netting 
  had 
  been 
  treated 
  with 
  a 
  thin 
  application 
  of 
  tree 
  

   tanglefoot 
  it 
  was 
  set 
  up 
  so 
  thai 
  caterpillars 
  were 
  likely 
  to 
  drift 
  upon 
  

   it 
  if 
  carried 
  by 
  the 
  prevailing 
  wind. 
  

  

  EXPERIMENTS 
  AT 
  LINCOLN, 
  MASS. 
  

   The 
  first 
  trap 
  was 
  placed 
  on 
  a 
  raft 
  (PI. 
  VI) 
  which 
  was 
  moored 
  

  

  near 
  the 
  center 
  of 
  Sandy 
  Pond. 
  Lincoln, 
  Mass. 
  Two 
  screens, 
  each 
  L2 
  

   feet 
  long 
  ;in 
  d 
  c, 
  iVet 
  high, 
  were 
  placed 
  at 
  right 
  angles 
  so 
  as 
  to 
  form 
  

   a 
  cross. 
  The 
  screen 
  n-ed 
  was 
  ordinary 
  poultry 
  wire 
  having 
  a 
  me-li 
  

   about 
  1 
  inch 
  in 
  diameter. 
  The 
  woodland 
  surrounding 
  this 
  pond 
  was 
  

   00474" 
  Bull. 
  119 
  1". 
  —2. 
  

  

  