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  peated 
  copulations 
  which 
  seem 
  necessary 
  to 
  the 
  fertilization 
  of 
  the 
  

   eggs, 
  or 
  by 
  checking 
  or 
  preventing 
  the 
  development 
  of 
  eggs 
  in 
  the 
  

   ovary 
  ? 
  

  

  9. 
  May 
  it 
  possibly 
  act 
  in 
  part 
  by 
  diluting 
  the 
  sap 
  of 
  the 
  food 
  

   plants, 
  rendering 
  this 
  sap 
  comparatively 
  innutritious 
  and 
  thus 
  re- 
  

   ducing 
  the 
  vigor 
  of 
  the 
  bugs 
  in 
  a 
  way 
  and 
  to 
  an 
  extent 
  to 
  diminish 
  

   their 
  reproductive 
  capacity 
  or 
  to 
  make 
  them 
  more 
  likely 
  to 
  succumb 
  

   to 
  the 
  attacks 
  of 
  fungus 
  parasites 
  and 
  other 
  causes 
  of 
  disease? 
  

  

  10. 
  Is 
  a 
  wet 
  winter 
  unfavorable 
  to 
  chinch-bugs. 
  and. 
  if 
  so, 
  why? 
  

  

  11. 
  Are 
  the 
  bugs 
  ever 
  killed 
  in 
  the 
  field 
  by 
  heat, 
  and 
  does 
  a 
  moist 
  

   heat 
  act 
  more 
  or 
  less 
  efficiently 
  than 
  an 
  equal 
  temperature 
  when 
  the 
  

   air 
  and 
  earth 
  are 
  comparatively 
  dry? 
  

  

  12. 
  May 
  a 
  midsummer 
  drouth 
  become 
  so 
  intense 
  and 
  long-con- 
  

   tinued 
  as 
  to* 
  affect 
  the 
  chinch-bug 
  unfavorably, 
  and, 
  if 
  so, 
  how 
  is 
  the 
  

   unfavorable 
  effect 
  brought 
  about? 
  

  

  13. 
  What 
  is 
  the 
  limit 
  to 
  midsummer 
  heat, 
  moist 
  and 
  dry, 
  to 
  

   which 
  the 
  chinch-bug 
  is 
  actually 
  exposed? 
  That 
  is, 
  what 
  is 
  the 
  

   maximum 
  temperature 
  of 
  the 
  surface 
  on 
  which 
  it 
  is 
  found 
  in 
  the 
  

   hottest 
  weather 
  of 
  the 
  year, 
  both 
  in 
  times 
  of 
  drouth 
  and 
  shortly 
  after 
  

   rains? 
  

  

  14. 
  Do 
  the 
  bugs 
  live 
  equally 
  long 
  and 
  lay 
  equal 
  numbers 
  of 
  fer- 
  

   tile 
  eggs 
  whatever 
  may 
  be 
  the 
  food 
  plant 
  to 
  which 
  they 
  are 
  limited? 
  

   Do 
  they 
  live 
  as 
  long 
  and 
  breed 
  as 
  rapidly 
  on 
  oats 
  and 
  grass, 
  for 
  ex- 
  

   ample, 
  as 
  on 
  wheat 
  and 
  corn? 
  

  

  15. 
  Are 
  there 
  any 
  conditions 
  of 
  the 
  food 
  plant, 
  such 
  as 
  thrifty 
  

   growth 
  or 
  the 
  reverse, 
  which 
  affect 
  the 
  longevity 
  or 
  reproductive 
  ac- 
  

   tivity 
  of 
  the 
  chinch-bug? 
  

  

  16. 
  Are 
  any 
  of 
  the 
  efficient 
  causes 
  made 
  out 
  to 
  be 
  finally 
  traced 
  

   back 
  to 
  peculiarities 
  of 
  soil 
  or 
  climate 
  or 
  agricultural 
  management; 
  

   or 
  does 
  the 
  complicated 
  assemblage 
  of 
  causes 
  and 
  conditions 
  which 
  

   govern 
  the 
  geographical 
  distribution 
  of 
  insects 
  have 
  any 
  important 
  

   bearing 
  upon 
  our 
  problem? 
  

  

  17. 
  What 
  are 
  the 
  known 
  contagious 
  diseases 
  of 
  the 
  chinch-bug, 
  

   and 
  how 
  is 
  their 
  presence 
  to 
  be 
  recognized 
  by 
  the 
  expert 
  and 
  by 
  the 
  

   ordinary 
  observer? 
  

  

  1(S. 
  What 
  are 
  their 
  relative 
  values 
  as 
  agents 
  of 
  destruction? 
  

  

  19. 
  What 
  observations 
  have 
  been 
  made 
  pointing 
  to 
  the 
  existence 
  

   of 
  other 
  diseases 
  not 
  yei 
  certainly 
  known? 
  

  

  20. 
  To 
  what 
  parasitic 
  organism 
  are 
  the 
  known 
  diseases 
  to 
  be 
  re- 
  

   spectively 
  attributed, 
  and 
  what 
  are 
  the 
  life 
  histories 
  of 
  such 
  or- 
  

   ganisms":' 
  

  

  21. 
  Are 
  they 
  completely 
  parasitic 
  in 
  habit, 
  or 
  oidy 
  partially 
  and 
  

   occasionally 
  so; 
  that 
  is, 
  are 
  they 
  true 
  or 
  "facultative" 
  parasites? 
  

  

  22. 
  If 
  true 
  parasites, 
  are 
  they 
  always 
  injurious, 
  or 
  do 
  they 
  be- 
  

   come 
  so 
  only 
  under 
  special 
  conditions? 
  

  

  