﻿XXXll 
  

  

  constant 
  one, 
  or 
  nearly 
  so. 
  Tlio 
  uppQrside 
  ap])roach 
  to 
  hippo- 
  

   coon 
  in 
  my 
  first 
  experiments 
  (1915) 
  varied 
  much 
  from 
  family 
  

   to 
  family 
  being 
  great 
  in 
  at 
  least 
  one 
  of 
  them 
  (and 
  involving 
  

   the 
  whole 
  f.-w. 
  pattern); 
  while, 
  in 
  one, 
  some 
  individuals 
  were 
  

   actually 
  Jdppocoon. 
  Tlicre 
  may 
  of 
  course 
  have 
  been 
  a 
  little 
  

   hippocoon 
  in 
  the 
  mother's 
  ancestry, 
  though 
  it 
  didn't 
  show 
  in 
  

   the 
  emergences 
  of 
  her 
  generation. 
  It 
  will 
  be 
  interesting 
  to 
  see 
  

   if 
  the 
  segregation 
  will 
  be 
  complete 
  in 
  F. 
  2 
  — 
  -into 
  hipjwcoon, 
  

   complete 
  cenea 
  and 
  incomplete 
  cenea. 
  I 
  shall 
  attempt 
  F. 
  2, 
  

   but 
  do 
  not 
  expect 
  success 
  because 
  I 
  am 
  due 
  to 
  g(j 
  on 
  

   another 
  tsetse 
  expedition 
  (this 
  time 
  for 
  the 
  Khodesian 
  

   (jiovt.) 
  as 
  soon 
  as 
  a 
  bad 
  foot 
  is 
  better, 
  and 
  because 
  of 
  

   another 
  journey 
  which 
  cannot 
  be 
  avoided. 
  My 
  plan 
  (already 
  

   begun) 
  is 
  to 
  pair 
  the 
  ' 
  y 
  ' 
  females 
  with 
  their 
  own 
  and 
  ' 
  ' 
  nuiles 
  

   and 
  to 
  pair 
  these 
  same 
  c^^J 
  a 
  second 
  time 
  Avith 
  the 
  'a' 
  (hippocoon) 
  

   9$, 
  to 
  ascertain 
  the 
  Jc^'s 
  composition. 
  But, 
  as 
  I 
  have 
  just 
  

   said, 
  the 
  chances 
  of 
  being 
  able 
  to 
  carry 
  the 
  experiment 
  through 
  

   are, 
  unfortunately, 
  almost 
  vdl. 
  

  

  " 
  Pairing 
  now 
  offers 
  little 
  dilliculty. 
  I 
  have 
  made 
  it 
  com- 
  

   pulsory 
  ! 
  The 
  genitalia 
  are 
  brought 
  into 
  correct 
  juxtajKxsiticm, 
  

   very 
  slight 
  pressure 
  is 
  exercised 
  on 
  the 
  sides 
  of 
  the 
  two 
  abdo- 
  

   mens 
  with 
  finger 
  and 
  'thumb 
  of 
  each 
  hand 
  and, 
  as 
  soon 
  as 
  

   the 
  c? 
  is 
  seen 
  (by 
  abdominal 
  movements) 
  to 
  take 
  on, 
  he 
  is 
  

   allowed 
  to 
  hang, 
  and 
  both 
  are 
  placed 
  in 
  a 
  box, 
  better 
  dark. 
  

   Some 
  cJJ 
  refuse. 
  The 
  pairings 
  of 
  which 
  I 
  am 
  now 
  seeing 
  

   the 
  results 
  were 
  obtained 
  in 
  this 
  way. 
  The 
  only 
  infertile 
  

   pairings 
  were 
  some 
  obtained 
  with 
  cenea 
  ^$ 
  that 
  I 
  had 
  had 
  

   to 
  keep 
  some 
  weeks 
  to 
  await 
  the 
  emergence 
  of 
  a 
  hippocoon 
  

   family. 
  It 
  was 
  doubtless 
  a 
  matter 
  of 
  senile 
  decay, 
  hastened 
  

   by 
  captivity 
  ! 
  Even 
  cripples 
  are 
  usable 
  by 
  this 
  method 
  : 
  

   $ 
  8 
  {v. 
  above) 
  from 
  which 
  I 
  obtained 
  the 
  continuation 
  of 
  

   my 
  pure 
  cenea 
  strain 
  (a 
  few 
  eggs 
  only, 
  it 
  is 
  true) 
  was 
  a 
  bad 
  

   crip])le. 
  Some 
  cripples, 
  of 
  course, 
  couldn't 
  lay. 
  

  

  " 
  April 
  19. 
  — 
  I 
  have 
  added 
  to 
  the 
  table 
  emergences 
  to 
  date, 
  

   all 
  corroborative. 
  

  

  " 
  My 
  first 
  cenea 
  paired 
  and 
  put 
  out 
  to 
  lay 
  was 
  killed 
  by 
  

   driver 
  ants, 
  which 
  also 
  destroyed 
  all 
  the 
  larvae 
  of 
  a 
  lot 
  of 
  

   local 
  hippocoon 
  families 
  I 
  had 
  in 
  hand 
  (for 
  your 
  inheritance 
  of 
  

   small 
  variations 
  work). 
  I 
  have 
  three 
  more 
  (all 
  y) 
  paired, 
  

  

  