﻿95 
  

  

  considerable 
  rains, 
  portions 
  of 
  the 
  original 
  culture 
  material 
  were 
  

   found 
  under 
  the 
  straw 
  where 
  this 
  had 
  been 
  scattered 
  upon 
  the 
  wheat, 
  

   with 
  a 
  good 
  fresh 
  growth 
  of 
  Sporotrichum, 
  some 
  of 
  it 
  profusely 
  

   fruiting. 
  It 
  would 
  seem 
  likely, 
  consequently, 
  that 
  the 
  exposure 
  to 
  

   the 
  sun 
  of 
  the 
  material 
  sown 
  broadcast 
  in 
  the 
  field 
  had 
  killed 
  the 
  

   fungous 
  growth 
  and 
  prevented 
  the 
  germination 
  of 
  the 
  spores— 
  an 
  ex- 
  

   planation 
  consistent 
  with 
  the 
  results 
  of 
  laboratory 
  experiments 
  to 
  be 
  

   rejiorted 
  in 
  another 
  place. 
  Although 
  decidedly 
  abundant 
  in 
  the 
  field, 
  

   no 
  chinch-bugs 
  were 
  found 
  under 
  straw 
  and 
  grass 
  strewn 
  upon 
  the 
  

   wheat 
  with 
  a 
  view 
  to 
  forming 
  a 
  suitable 
  culture 
  bed 
  for 
  the 
  Sporo- 
  

   trichum 
  infection. 
  Neither 
  was 
  there 
  in 
  these 
  places 
  any 
  fresh 
  

   growth 
  of 
  the 
  Sporotrichum 
  itself. 
  

  

  A 
  quantity 
  of 
  additional 
  material 
  from 
  the 
  contagion 
  boxes 
  was 
  

   now 
  distributed, 
  consisting, 
  as 
  before, 
  of 
  dead 
  and 
  living 
  bugs 
  and 
  

   debris 
  from 
  the 
  bottom 
  of 
  the 
  box 
  in 
  which 
  they 
  had 
  been 
  kept. 
  

   On 
  the 
  24:th. 
  the 
  weather 
  .having 
  in 
  the 
  meantime 
  remained 
  clear, 
  

   warm 
  and 
  dry. 
  another 
  large 
  quantity 
  of 
  this 
  contagion-box 
  material 
  

   was 
  distributed, 
  being 
  a 
  third 
  of 
  the 
  contents 
  of 
  each 
  of 
  two 
  such 
  

   boxes 
  two 
  feet 
  wide 
  by 
  three 
  feet 
  long. 
  Bugs 
  were 
  now 
  beginning 
  

   to 
  leave 
  the 
  wheat, 
  which 
  was 
  very 
  dry 
  and 
  quite 
  yellow, 
  and 
  to 
  

   enter 
  the 
  corn 
  adjacent. 
  Adults 
  of 
  the 
  new 
  generation 
  were 
  begin- 
  

   ning 
  to 
  pair, 
  and 
  they 
  were 
  also 
  sparingly 
  distributed 
  throughout 
  

   the 
  corn 
  field 
  generally, 
  having 
  evidently 
  flown 
  in 
  from 
  the 
  wheat. 
  

   The 
  field 
  was 
  harvested 
  June 
  25. 
  The 
  bugs 
  g/adually 
  left 
  this 
  plot, 
  

   going 
  in 
  different 
  directions 
  to 
  corn, 
  oats, 
  and 
  sorghum, 
  but 
  linger- 
  

   ing 
  also 
  for 
  a 
  considerable 
  time 
  in 
  the 
  stubble, 
  feeding 
  uj^on 
  the 
  

   grass-like 
  weeds 
  (Setaria). 
  Towards 
  the 
  end 
  of 
  June 
  the 
  weather 
  

   became 
  comi^aratively 
  moist, 
  a 
  fourth 
  of 
  an 
  inch 
  of 
  rain 
  falling 
  on 
  

   the 
  25th, 
  a 
  tenth 
  on 
  the 
  26th, 
  five 
  hundredths 
  on 
  the 
  29th, 
  and 
  1.07 
  

   inches 
  on 
  the 
  30th 
  — 
  nearly 
  an 
  inch 
  and 
  a 
  half 
  on 
  the 
  last 
  five 
  days 
  of 
  

   the 
  month. 
  The 
  temperature 
  during 
  this 
  interval 
  fell 
  oft' 
  materially, 
  

   reaching 
  96 
  on 
  the 
  25th, 
  84' 
  on 
  the 
  26th, 
  the 
  maximum 
  then 
  

   dropping 
  away 
  gradually 
  to 
  68^ 
  on 
  the 
  80th, 
  when 
  the 
  mean 
  daily 
  

   temperature 
  fell 
  from 
  73" 
  on 
  the 
  25th 
  to 
  63 
  ' 
  on 
  the 
  30th. 
  The 
  en- 
  

   tire 
  rainfall 
  of 
  the 
  month, 
  preceding 
  the 
  25th 
  had 
  been 
  but 
  .7 
  of 
  an 
  

   inch, 
  and 
  the 
  maximum 
  temperature 
  had 
  been 
  above 
  90° 
  on 
  fourteen 
  

   out 
  of 
  the 
  twenty-four 
  days. 
  A 
  clear 
  sky 
  was 
  recorded 
  forty-five 
  

   times 
  out 
  of 
  seventy-two 
  observations 
  made. 
  The 
  weather 
  of 
  this 
  

   period 
  may 
  consequently 
  be 
  described 
  as 
  very 
  hot, 
  dry, 
  and 
  bright. 
  

   June 
  28 
  a 
  good 
  many 
  chinch-bugs 
  were 
  seen 
  under 
  the 
  straw 
  and 
  

   grass 
  in 
  the 
  wheat 
  stu})ble, 
  evidently 
  driven 
  to 
  shelter 
  from 
  the 
  di- 
  

   rect 
  rays 
  of 
  the 
  sun. 
  A 
  large 
  quantity 
  of 
  infection 
  material 
  from 
  

   our 
  contagion 
  boxes 
  was 
  scattered 
  on 
  this 
  day 
  among 
  the 
  chinch- 
  

   bugs 
  in 
  the 
  oats 
  adjoining 
  the 
  wheat, 
  and 
  the 
  contents 
  of 
  three 
  pans 
  

   of 
  a 
  corn-meal 
  culture 
  were 
  distributed 
  among 
  the 
  insects 
  on 
  the 
  

   sorghum 
  adjoining, 
  the 
  bugs 
  in 
  both 
  cases 
  being 
  those 
  that 
  had 
  en- 
  

   tered 
  these 
  plots 
  from 
  the 
  wheat. 
  On 
  the 
  2d 
  of 
  July, 
  after 
  the 
  rain- 
  

   fall 
  of 
  the 
  last 
  of 
  June, 
  several 
  dozen 
  dead 
  chinch-bugs 
  were 
  found 
  

   in 
  the 
  oats 
  covered 
  with 
  a 
  profuse 
  fresh 
  growth 
  of 
  muscardine 
  fun- 
  

   gus. 
  They 
  were 
  lying 
  on 
  the 
  ground 
  under 
  a 
  dense 
  cluster 
  of 
  

   grain 
  broken 
  down 
  by 
  the 
  reaper, 
  and 
  also 
  under 
  other 
  rubbish 
  

  

  