﻿SUBMERSION, 
  ETC. 
  ON 
  LARVAE 
  OF 
  CIMEX 
  LECTULARIUS. 
  113 
  

  

  all 
  from 
  the 
  same 
  batch 
  of 
  eggs, 
  but 
  the 
  eggs 
  had 
  all 
  been 
  subjected 
  to 
  similar 
  con- 
  

   ditions 
  prior 
  to 
  hatching. 
  

  

  Ova 
  subjected 
  to 
  cool 
  conditions. 
  

  

  34 
  eggs 
  of 
  batch 
  (q), 
  kept 
  between 
  40° 
  and 
  55° 
  F. 
  (average 
  temperature 
  about 
  

   48° 
  F.) 
  for 
  12 
  days 
  and 
  then 
  transferred 
  to 
  75 
  °F— 
  32 
  hatched=94 
  per 
  cent. 
  (Control, 
  

   92 
  per 
  cent, 
  hatched.) 
  

  

  26 
  eggs 
  of 
  batch 
  (q), 
  kept 
  between 
  40° 
  and 
  55° 
  F. 
  (average 
  temperature 
  about 
  

   48° 
  F.) 
  for 
  20 
  days 
  and 
  then 
  transferred 
  to 
  75° 
  F.— 
  16 
  hatched=61 
  per 
  cent. 
  (Control, 
  

   92 
  per 
  cent, 
  hatched.) 
  

  

  46 
  eggs 
  of 
  batch 
  (k), 
  kept 
  between 
  40° 
  and 
  55° 
  F. 
  (average 
  temperature 
  about 
  

   48° 
  F.) 
  for 
  31 
  days 
  and 
  then 
  transferred 
  to 
  75° 
  F. 
  — 
  25 
  hatched=54 
  per 
  cent. 
  (Control, 
  

   100 
  per 
  cent, 
  hatched.) 
  

  

  A 
  marked 
  feature 
  of 
  the 
  last 
  two 
  experiments 
  was 
  .the 
  number 
  of 
  deaths 
  during 
  

   the 
  act 
  of 
  emergence 
  from 
  the 
  egg 
  ; 
  in 
  the 
  last 
  experiment 
  no 
  less 
  than 
  10 
  (21 
  per 
  

   cent.) 
  failed 
  to 
  get 
  free 
  from 
  the 
  egg-shell. 
  

  

  Ova 
  subjected 
  to 
  cold. 
  

  

  20 
  eggs 
  of 
  batch 
  (/) 
  kept 
  at 
  28° 
  F. 
  for 
  6J 
  hours 
  and 
  then 
  transferred 
  to 
  75° 
  F. 
  

   — 
  28 
  hatched 
  = 
  100 
  per 
  cent. 
  (Control, 
  93 
  per 
  cent, 
  hatched 
  .) 
  

  

  20 
  eggs 
  of 
  batch 
  (g) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  24 
  hours 
  and 
  then 
  transferred 
  

   to 
  75° 
  F. 
  — 
  19 
  hatched 
  = 
  95 
  per 
  cent. 
  (Control, 
  84 
  per 
  cent, 
  hatched.) 
  

  

  14 
  eggs 
  of 
  batch 
  (h) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  2 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F.— 
  13 
  hatched 
  = 
  93 
  per 
  cent. 
  (Control, 
  100 
  per 
  cent, 
  hatched.) 
  

  

  16 
  eggs 
  of 
  batch 
  (i) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  5 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F. 
  — 
  4 
  hatched 
  = 
  25 
  per 
  cent. 
  (Control, 
  100 
  per 
  cent, 
  hatched.) 
  

  

  41 
  eggs 
  of 
  batch 
  (o) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  8 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F.— 
  10 
  hatched 
  = 
  24 
  per 
  cent. 
  (Control, 
  100 
  per 
  cent, 
  hatched.) 
  

  

  45 
  eggs 
  of 
  batch 
  (a) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  10 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F. 
  — 
  none 
  hatched. 
  (Control, 
  see 
  batch 
  (a) 
  under 
  Heat.) 
  

  

  8 
  eggs 
  of 
  batch 
  (b) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  10 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F. 
  — 
  none 
  hatched. 
  (Control, 
  see 
  batch 
  (6) 
  under 
  Heat.) 
  

  

  29 
  eggs 
  of 
  batch 
  (b) 
  kept 
  between 
  28° 
  and 
  32° 
  F. 
  for 
  15 
  days 
  and 
  then 
  transferred 
  

   to 
  75° 
  F. 
  — 
  none 
  hatched. 
  

  

  Ova 
  subjected 
  to 
  heat. 
  

  

  45 
  eggs 
  of 
  batch 
  (a) 
  kept 
  at 
  98° 
  F., 
  humidity 
  *25 
  ; 
  — 
  41 
  hatched 
  = 
  91 
  per 
  cent. 
  

  

  38 
  eggs 
  of 
  batch 
  (6) 
  kept 
  at 
  98° 
  F., 
  humidity 
  -25 
  ;— 
  -38 
  hatched 
  = 
  100 
  per 
  cent. 
  

  

  50 
  eggs 
  of 
  batch 
  (/) 
  kept 
  at 
  113° 
  F. 
  ; 
  — 
  none 
  hatched. 
  (Control, 
  93 
  per 
  cent, 
  hatched.) 
  

  

  Ova 
  submerged 
  in 
  water. 
  

  

  Between 
  60° 
  and 
  63° 
  F. 
  

  

  11 
  eggs 
  of 
  batch 
  (c) 
  submerged 
  for 
  26 
  hours 
  — 
  11 
  hatched 
  = 
  100 
  per 
  cent. 
  (Control, 
  

   96 
  per 
  cent, 
  hatched.) 
  

  

  30 
  eggs 
  of 
  batch 
  (e) 
  submerged 
  for 
  44hours 
  — 
  23 
  hatched 
  = 
  76 
  per 
  cent. 
  (Control, 
  

   93 
  per 
  cent, 
  hatched.) 
  

  

  (C53) 
  b 
  

  

  