﻿INTEGQMENT. 
  27 
  

  

  " 
  quite 
  black," 
  and 
  during 
  metamorphosis 
  assume 
  the 
  

   hght 
  yellowish-grey 
  ground 
  colour 
  through 
  the 
  greater 
  

   part 
  of 
  the 
  pigment-cells 
  turning 
  pale. 
  A 
  more 
  

   glaring 
  misrepresentation 
  could 
  not 
  be 
  imagined. 
  

   Far 
  from 
  being 
  black, 
  the 
  tadpole 
  of 
  Pelohates 
  fuscus 
  

   is 
  normally 
  pale 
  brown, 
  with 
  darker 
  spots 
  and 
  marb- 
  

   lings, 
  as 
  may 
  be 
  seen 
  from 
  the 
  figure 
  in 
  this 
  work. 
  

   And 
  the 
  tadpole 
  of 
  Pelohates 
  cidtri/pes, 
  a 
  species 
  which 
  

   has 
  the 
  same 
  dark 
  spots 
  as 
  P. 
  fuscus 
  after 
  transfor- 
  

   mation, 
  is 
  usually 
  very 
  pale 
  reddish 
  yellow. 
  A 
  proof 
  

   that 
  the 
  yellow 
  and 
  red 
  pigments 
  are 
  chemically 
  dis- 
  

   tinct 
  from 
  the 
  brown 
  or 
  black 
  is 
  to 
  be 
  found 
  in 
  the 
  

   different 
  action 
  of 
  alcohol 
  on 
  them. 
  Thus 
  yellow 
  

   pigment 
  is 
  rapidly 
  destroyed; 
  therefore 
  green 
  frogs 
  

   turn 
  olive 
  or 
  blue 
  in 
  spirit. 
  Certain 
  crimson 
  pig- 
  

   ments, 
  not 
  unfrequent 
  in 
  frogs, 
  resist 
  the 
  action 
  of 
  

   alcohol 
  and 
  light 
  better 
  than 
  the 
  brown, 
  which 
  by 
  dis- 
  

   coloration 
  may 
  turn 
  to 
  reddish 
  brown 
  or 
  rufous, 
  these 
  

   two 
  reds 
  strongly 
  contrasting 
  in 
  specimens 
  that 
  have 
  

   long 
  been 
  in 
  spirit, 
  Tornier 
  goes 
  even 
  so 
  far 
  as 
  to 
  doubt 
  

   the 
  presence 
  of 
  any 
  but 
  the 
  brown 
  pigment 
  in 
  reptiles 
  ; 
  

   surely 
  the 
  green 
  of 
  certain 
  tree-snakes 
  of 
  the 
  genera 
  

   Dryophis 
  and 
  Lachesis, 
  which 
  colour 
  the 
  spirit 
  in 
  which 
  

   they 
  are 
  preserved 
  to 
  the 
  extent 
  of 
  resembling 
  green 
  

   Chartreuse, 
  is 
  due 
  to 
  the 
  presence 
  of 
  a 
  chemically 
  

   distinct 
  colouring 
  matter, 
  and 
  has 
  no 
  relation 
  whatever 
  

   to 
  the 
  green 
  of 
  frogs, 
  which, 
  produced, 
  as 
  we 
  have 
  seen, 
  

   by 
  a 
  combination 
  of 
  black 
  and 
  yellow, 
  disappears 
  in 
  

   spirit 
  when 
  the 
  latter 
  pigment 
  is 
  destroyed. 
  

  

  Another 
  instance 
  of 
  the 
  same 
  author's 
  carelessness 
  

   in 
  the 
  selection 
  of 
  examples 
  is 
  to 
  be 
  found 
  a 
  little 
  

   further 
  in 
  the 
  same 
  work 
  (p. 
  130), 
  where 
  he 
  declares 
  

   that 
  Batrachian 
  larvae 
  which 
  develop 
  in 
  the 
  light 
  are, 
  

   with 
  few 
  exceptions, 
  uniformly 
  dark, 
  or 
  more 
  usually 
  

   deep 
  black, 
  and 
  retain 
  that 
  coloration 
  until 
  close 
  to 
  

   the 
  metamorphosis. 
  I 
  believe 
  the 
  exception 
  is 
  just 
  

   the 
  other 
  way. 
  The 
  embryos 
  of 
  Bomhinator 
  and 
  

   Alytes 
  are 
  yellowish 
  or 
  pale 
  brown 
  striped 
  with 
  

   blackish, 
  those 
  of 
  5?//a 
  uniform 
  yellowish, 
  those 
  o^Rana 
  

  

  