﻿74 
  

  

  after 
  fertilization, 
  I 
  could 
  only 
  find 
  a 
  very 
  few 
  embryos 
  

   after 
  a 
  long, 
  patient 
  and 
  careful 
  search, 
  which 
  occupied 
  

   several 
  liours. 
  Those 
  discovered 
  were 
  similar 
  in 
  all 
  re- 
  

   spects 
  to 
  those 
  last 
  described, 
  and 
  as 
  figured 
  by 
  Brooks, 
  

   in 
  No. 
  44. 
  

  

  On 
  the 
  15th, 
  T 
  met 
  with 
  a 
  total 
  failure 
  in 
  my 
  search 
  for 
  

   the 
  embryos, 
  and 
  it 
  was 
  both 
  long 
  and 
  carefully 
  con- 
  

   ducted, 
  and 
  the 
  same 
  want 
  of 
  success 
  attended 
  me 
  on 
  the 
  

   16th. 
  when 
  I 
  gave 
  up 
  the 
  attempt 
  to 
  further 
  trace 
  the 
  

   development. 
  

  

  It 
  will 
  be 
  observed 
  that 
  I 
  could 
  not 
  find 
  any 
  embryos 
  

   of 
  a 
  more 
  advanced 
  stage 
  than 
  those 
  figured 
  by 
  Brooks, 
  

   and 
  that 
  owing, 
  probably, 
  to 
  the 
  irregular 
  rate 
  of 
  seg- 
  

   mentation, 
  I 
  found 
  them 
  at 
  the 
  latter 
  stages 
  at 
  j^eriods 
  

   varying 
  from 
  three 
  to 
  eight 
  days. 
  

  

  It 
  is 
  not 
  probable 
  that 
  the 
  disappearance 
  of 
  the 
  embryo 
  

   was 
  due 
  to 
  a 
  deticient 
  supply 
  of 
  water, 
  for 
  during 
  the 
  

   latter 
  days 
  of 
  their 
  existence 
  they 
  were 
  far 
  more 
  liberally 
  

   supplied 
  than 
  before. 
  Neither 
  is 
  it 
  probably 
  due 
  to 
  

   change 
  of 
  temperature, 
  for, 
  as 
  wall 
  be 
  seen 
  by 
  the 
  follow- 
  

   ing 
  tables 
  of 
  maximum 
  and 
  minimum 
  temperatures, 
  the 
  

   range 
  of 
  temperature 
  was 
  about 
  the 
  same 
  throughout 
  the 
  

   eight 
  days 
  : 
  

  

  The 
  water 
  supplied 
  to 
  the 
  embryos 
  was 
  always 
  allowed 
  

   to 
  stand 
  a 
  sutlicient 
  time 
  to 
  acquire 
  the 
  temperature 
  of 
  

   the 
  air 
  before 
  being 
  added 
  to 
  that 
  already 
  in 
  the 
  jar. 
  

  

  