﻿732 
  

  

  Mr. 
  H. 
  E. 
  Watson 
  on 
  some 
  

  

  4500 
  

  

  5000 
  

  

  Wave-length. 
  

   5500 
  6000 
  

  

  6500 
  

  

  7000 
  

  

  0-9 
  

  

  _£ 
  07 
  

  

  0-3 
  

  

  0-2 
  

  

  "", 
  f 
  "~ 
  — 
  Ceruleum. 
  

  

  _g 
  0-7 
  

  

  0-6 
  

  

  too 
  

   — 
  0-5 
  

  

  0-4 
  

  

  S 
  0-3 
  

  

  0-2 
  

  

  O'O 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  •—''\ 
  

  

  

  

  

  

  

  

  

  / 
  

  

  \ 
  

  

  N 
  

  

  N 
  

  

  

  

  

  ~\ 
  

  

  

  

  

  

  / 
  

  

  " 
  

  

  ^. 
  

  

  * 
  V««k 
  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  N 
  

   \ 
  

  

  \ 
  

   \ 
  

  

  

  

  

  "*. 
  

  

  v 
  / 
  

  

  •^». 
  

  

  

  

  

  ,-•• 
  s 
  

  

  \. 
  

  

  

  

  

  /..-" 
  

  

  .«•• 
  

  

  

  ..«• 
  

  

  

  

  

  

  rrrtr»T 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  

  / 
  

   / 
  

  

  7^ 
  — 
  

  

  / 
  

  

  N 
  

  

  ^^_ 
  

  

  

  

  

  

  

  / 
  

  

  

  / 
  

  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  / 
  

   / 
  

  

  

  / 
  

  

  

  

  

  

  

  

  

  i 
  

  

  

  .'•"" 
  

  

  

  

  

  

  

  

  / 
  

  

  f 
  

  

  yl 
  

  

  

  

  

  

  

  

  

  / 
  

  

  / 
  

  

  m 
  " 
  1 
  

  

  

  

  

  

  

  

  

  / 
  / 
  

  

  / 
  

  

  

  

  j*'' 
  

  

  

  

  

  

  

  F 
  

  

  

  — 
  

  

  ^.*»* 
  

  

  

  

  

  

  

  

  

  

  Cobalt 
  blue. 
  

  

  Malachite 
  green. 
  

   Chromium 
  

   green 
  oxide. 
  

  

  Cadmium 
  yellow. 
  

  

  Strontium 
  

  

  yellow. 
  

   Naples 
  yellow. 
  

  

  Eaw 
  umber 
  

  

  4500 
  

  

  5000 
  

  

  5500 
  6000 
  6500 
  7000 
  

  

  