﻿DIKECTIOK 
  AND 
  VELOCITY 
  OF 
  WIND. 
  39 
  

  

  are 
  in 
  the 
  same 
  direction 
  during 
  the 
  first 
  half 
  of 
  June 
  as 
  in 
  the 
  

   month 
  of 
  May, 
  so 
  that 
  little 
  benefit 
  would 
  be 
  derived 
  from 
  giving 
  

   the 
  additional 
  data. 
  

  

  For 
  convenience 
  the 
  record 
  of 
  infestation 
  has 
  been 
  divided 
  into 
  

   four 
  periods 
  (see 
  map 
  1), 
  viz: 
  

  

  (1) 
  The 
  territory 
  infested 
  in 
  1900 
  at 
  the 
  time 
  the 
  work 
  was 
  dis- 
  

   continued 
  by 
  the 
  State 
  of 
  Massachusetts. 
  

  

  (2) 
  The 
  territory 
  found 
  infested 
  as 
  a 
  result 
  of 
  scouting 
  operations 
  

   after 
  the 
  work 
  was 
  resumed 
  in 
  the 
  winter 
  of 
  1905-6 
  by 
  the 
  State 
  of 
  

   Massachusetts. 
  

  

  (3) 
  The 
  territory 
  found 
  infested 
  up 
  to 
  and 
  including 
  the 
  winter 
  

   of 
  1908-9. 
  

  

  (4) 
  The 
  territory 
  infested 
  at 
  the 
  present 
  time, 
  winter 
  of 
  1911-12. 
  

   The 
  territory 
  infested 
  in 
  1900 
  when 
  the 
  gipsy-moth 
  work 
  was 
  

  

  discontinued 
  by 
  the 
  State 
  of 
  Massachusetts 
  was 
  confined 
  to 
  34 
  towns 
  

   and 
  cities 
  surrounding 
  Boston, 
  covering 
  an 
  area 
  of 
  about 
  359 
  square 
  

   miles. 
  None 
  of 
  the 
  area 
  was 
  badly 
  infested, 
  but 
  a 
  very 
  rapid 
  in- 
  

   crease 
  of 
  the 
  pest 
  took 
  place 
  as 
  soon 
  as 
  efforts 
  to 
  check 
  it 
  were 
  

   abandoned. 
  The 
  next 
  two 
  years 
  developed 
  few 
  signs 
  of 
  increase 
  

   in 
  the 
  insect, 
  although 
  in 
  several 
  localities 
  it 
  was 
  somewhat 
  abundant 
  

   in 
  1902. 
  An 
  infestation 
  was 
  discovered 
  in 
  Providence, 
  R. 
  I., 
  in 
  the 
  

   summer 
  of 
  1901. 
  In 
  the 
  summers 
  of 
  1903, 
  1904, 
  and 
  1905 
  the 
  terri- 
  

   tory 
  in 
  Massachusetts 
  which 
  had 
  been 
  most 
  densely 
  infested 
  when 
  

   the 
  work 
  was 
  discontinued 
  fairly 
  swarmed 
  with 
  caterpillars, 
  and, 
  

   as 
  little 
  organized 
  effort 
  was 
  made 
  to 
  check 
  the 
  insect, 
  an 
  excellent 
  

   opportunity 
  was 
  offered 
  for 
  the 
  small 
  caterpillars 
  to 
  be 
  spread 
  by 
  

   the 
  wind. 
  Map 
  1 
  shows 
  the 
  territory 
  which 
  was 
  found 
  infested 
  by 
  

   the 
  scouting 
  operations 
  conducted 
  by 
  the 
  State 
  of 
  Massachusetts, 
  

   which 
  were 
  carried 
  on 
  during 
  the 
  summer 
  and 
  fall 
  of 
  1905. 
  The 
  

   infestation 
  had 
  increased 
  to 
  such 
  an 
  extent 
  that 
  it 
  covered 
  132 
  towns 
  

   and 
  extended 
  from 
  Portsmouth, 
  N. 
  H., 
  to 
  Buzzards 
  Bay, 
  including, 
  

   as 
  well, 
  isolated 
  colonies 
  in 
  Providence 
  and 
  Cranston, 
  R. 
  I., 
  and 
  Ston- 
  

   ington, 
  Conn., 
  a 
  total 
  of 
  about 
  2,224 
  square 
  miles. 
  

  

  Undoubtedly 
  the 
  greater 
  part 
  of 
  this 
  infestation 
  was 
  the 
  result 
  

   of 
  wind 
  spread, 
  therefore 
  map 
  1 
  indicates 
  the 
  number 
  of 
  days 
  the 
  

   wind 
  blew 
  in 
  each 
  direction 
  during 
  the 
  period 
  when 
  caterpillars 
  

   were 
  in 
  the 
  first 
  stage, 
  and 
  when 
  the 
  temperature 
  and 
  wind 
  velocity 
  

   were 
  favorable 
  to 
  their 
  dispersion. 
  Eliminating 
  the 
  west 
  wind 
  from 
  

   consideration, 
  which 
  would 
  take 
  the 
  larva3 
  out 
  to 
  sea. 
  it 
  will 
  be 
  

   noted 
  that, 
  except 
  for 
  seven 
  days 
  when 
  it 
  was 
  from' 
  the 
  east 
  and 
  

   north, 
  the 
  direction 
  of 
  the 
  wind 
  would 
  account 
  in 
  a 
  general 
  way 
  for 
  

   the 
  infested 
  region 
  as 
  shown 
  by 
  the 
  map. 
  It 
  is 
  probable 
  that 
  more 
  

   area 
  would 
  have 
  been 
  found 
  infested 
  in 
  southern 
  New 
  Hampshire 
  

   in 
  1905 
  if 
  it 
  had 
  been 
  possible 
  to 
  scout 
  the 
  towns 
  nearest 
  Massa- 
  

   chusetts, 
  but 
  there 
  were 
  no 
  funds 
  available 
  for 
  this 
  purpose. 
  

  

  