﻿Wood. 
  

  

  Phil. 
  Mag. 
  Ser. 
  6. 
  Vol. 
  16, 
  PI. 
  XXVIII. 
  

  

  

  S 
  

  

  D 
  

  

  H 
  

   u 
  

  

  w 
  

  

  Pu 
  

  

  CO 
  

  

  S 
  

   D 
  

  

  Q 
  

   O 
  

  

  CO 
  

  

  W 
  

   H 
  

  

  O 
  

  

  

  - 
  ii 
  

  

  2 
  

  

  O 
  

  

  CO 
  

  

  2 
  

  

  W 
  

   H 
  

  

  X 
  

   W 
  

  

  && 
  

  

  