﻿Plate 
  39. 
  

  

  ? 
  °YouS'^ 
  yejSifr 
  rS!?^' 
  ^•''■^' 
  '""'"'^ 
  enlarged, 
  and 
  viewed 
  as 
  an 
  opaque 
  object. 
  Only 
  a 
  slight 
  rem- 
  

   ind 
  nKlimenlk;y-Ii/?b7add«^^ 
  it-^/'1n£S 
  %VJ] 
  ''I^f.^Vf 
  ^"'^ 
  ^'^r'^y 
  '-^^ 
  ^ 
  transparent 
  object: 
  py 
  l.^•lorus 
  

   already 
  so 
  far 
  developed 
  as 
  pa.^V 
  t'^conceaUhe 
  i^ranchl^''' 
  '^^ 
  '■""^'"" 
  "^ 
  '"■^'^^^'^^ 
  f°°'l- 
  ^'le 
  op'e^Vla 
  are 
  

  

  