﻿— 
  6 
  — 
  

  

  A 
  careful 
  inspection 
  made 
  by 
  an 
  office 
  Assistant 
  some 
  months 
  later 
  dis- 
  

   covered 
  no 
  others 
  in 
  this 
  entire 
  neighborhood; 
  nevertheless 
  on 
  the 
  date 
  

   of 
  Mr. 
  Braucher's 
  visit, 
  several 
  pear-trees 
  and 
  one 
  peach-tree 
  in 
  the 
  

   immediate 
  vicinity 
  of 
  the 
  tree 
  originally 
  attacked, 
  and 
  a 
  plum-tree 
  two 
  

   or 
  three 
  hundred 
  feet 
  from 
  it, 
  were 
  all 
  found 
  slightly 
  infested, 
  the 
  plum- 
  

   tree 
  evidently 
  by 
  means 
  of 
  nesting 
  birds. 
  On 
  this 
  the 
  scales 
  were 
  

   clearly 
  most 
  abundant 
  on 
  the 
  forking 
  branch 
  of 
  the 
  tree 
  supporting 
  a 
  

   last 
  year's 
  nest. 
  

  

  At 
  Richview, 
  where 
  but 
  three 
  colonies 
  had 
  been 
  previously 
  reported, 
  

   — 
  one 
  of 
  which 
  proved 
  upon 
  more 
  critical 
  examination 
  to 
  be 
  an 
  allied 
  

   scale, 
  — 
  fourteen 
  colonies 
  of 
  the 
  San 
  Jose 
  scale 
  on 
  as 
  many 
  different 
  

   premises 
  were 
  finally 
  found. 
  All 
  these 
  were 
  in 
  the 
  vicinity 
  of 
  the 
  town, 
  

   and 
  so 
  far 
  as 
  known 
  all 
  had 
  been 
  derived 
  from 
  a 
  common 
  source. 
  

  

  Careful 
  study 
  of 
  this 
  district 
  suggested 
  some 
  interesting 
  queries 
  

   with 
  respect 
  to 
  the 
  mode 
  of 
  distribution 
  of 
  the 
  scale 
  and 
  to 
  variations 
  

   in 
  its 
  attack. 
  It 
  was 
  found, 
  for 
  example, 
  to 
  be 
  very 
  much 
  more 
  abund- 
  

   ant 
  in 
  infested 
  orchards 
  upon 
  young 
  trees 
  than 
  upon 
  old 
  and 
  large 
  ones 
  

   immediately 
  adjacent. 
  Indeed 
  it 
  was 
  often 
  impossible 
  to 
  find 
  it 
  upon 
  

   any 
  part 
  of 
  large 
  trees 
  standing 
  beside 
  small 
  infested 
  ones 
  at 
  so 
  short 
  a 
  

   distance 
  that 
  the 
  young 
  must 
  have 
  been 
  frequently 
  conveyed 
  to 
  the 
  

   larger 
  trees. 
  It 
  seems 
  possible 
  that 
  in 
  such 
  case 
  the 
  young 
  scales 
  per- 
  

   ished 
  because 
  they 
  were 
  unable 
  to 
  reach 
  a 
  part 
  of 
  the 
  tree 
  from 
  which 
  

   they 
  could 
  draw 
  sap. 
  In 
  several 
  instances 
  small 
  numbers 
  of 
  the 
  San 
  

   Jose 
  scale 
  were 
  found 
  in 
  the 
  midst 
  of 
  orchards 
  of 
  considerable 
  size 
  at 
  

   distances 
  as 
  great 
  as 
  half 
  a 
  mile 
  from 
  the 
  nearest 
  infested 
  premises, 
  and 
  

   in 
  others 
  the 
  scale 
  was 
  very 
  sparsely 
  distributed 
  over 
  a 
  considerable 
  part 
  

   of 
  an 
  orchard 
  not 
  otherwise 
  infested. 
  Observations 
  to 
  this 
  effect 
  were 
  

   made 
  only 
  in 
  districts 
  where 
  the 
  scale 
  had 
  become 
  decidedly 
  abundant 
  

   and 
  destructive 
  at 
  several 
  points. 
  It 
  seems, 
  in 
  fact, 
  to 
  spread 
  slowly 
  

   and 
  steadily 
  from 
  the 
  points 
  of 
  first 
  introduction 
  until 
  it 
  reaches 
  a 
  certain 
  

   abundance, 
  when 
  its 
  distribution 
  becomes 
  so 
  rapid 
  and 
  general 
  that 
  the 
  

   attack 
  may 
  almost 
  be 
  said 
  to 
  become 
  epidemic. 
  Three 
  methods 
  of 
  dis- 
  

   tribution 
  may 
  be 
  suggested 
  in 
  explanation 
  of 
  these 
  facts: 
  the 
  well-known 
  

   transfer 
  by 
  means 
  of 
  nesting 
  birds; 
  the 
  probable 
  transfer 
  of 
  the 
  freshly 
  

   hatched 
  young 
  by 
  strong 
  and 
  long-continued 
  winds; 
  and 
  the 
  passage 
  

   of 
  human 
  beings, 
  particularly 
  during 
  the 
  season 
  of 
  fruit 
  harvest, 
  from 
  

   infested 
  orchards 
  to 
  others 
  in 
  all 
  directions 
  and 
  to 
  considerable 
  dis- 
  

   tances. 
  It 
  will 
  be 
  seen 
  at 
  once 
  that 
  whenever 
  this 
  stage 
  of 
  general, 
  

   sparse, 
  and 
  obscure 
  dispersal 
  has 
  been 
  reached, 
  the 
  complete 
  extermina- 
  

   tion 
  of 
  the 
  scale 
  in 
  that 
  locality 
  is 
  hardly 
  to 
  be 
  expected 
  without 
  most 
  

   thoroughgoing, 
  oft-repeated, 
  and 
  long-continued 
  insecticide 
  measures. 
  

  

  Serious 
  as 
  was 
  the 
  case 
  at 
  Richview, 
  that 
  in 
  the 
  Sparta 
  neighbor- 
  

  

  