﻿12 
  

  

  J. 
  Stansfield 
  — 
  Retarded 
  Diffusion 
  and 
  

  

  ever, 
  that 
  this 
  explanation 
  is 
  too 
  simple, 
  and 
  that 
  the 
  hydrions 
  

   present 
  may 
  have 
  to 
  be 
  taken 
  into 
  account. 
  

  

  Another 
  question 
  should 
  be 
  discussed 
  at 
  this 
  point. 
  In 
  all 
  the 
  

   bands 
  and 
  in 
  the 
  non-banded 
  layer 
  in 
  the 
  experiments 
  with 
  dif- 
  

   fusion 
  outward 
  of 
  chromate, 
  and 
  in 
  the 
  outer 
  bands 
  and 
  the 
  

   granular 
  non-banded 
  area 
  in 
  the 
  case 
  of 
  outward 
  diffusion 
  of 
  

  

  Fig. 
  2, 
  

  

  \& 
  

  

  

  

  Fig. 
  2. 
  x 
  5. 
  A 
  portion 
  of 
  the 
  sauoe 
  (fig. 
  1) 
  enlarged 
  to 
  show 
  the 
  character 
  

   of 
  the 
  precipitate 
  in 
  the 
  " 
  granular" 
  zones. 
  

  

  silver, 
  the 
  precipitate 
  consists 
  of 
  large 
  isolated 
  granules 
  some- 
  

   times 
  taking 
  on 
  irregular 
  shapes, 
  in 
  the 
  more 
  pronounced 
  and 
  

   well-marked 
  bands, 
  probably 
  as 
  a 
  result 
  of 
  accretion 
  of 
  several 
  

   granules. 
  (See 
  figs. 
  1 
  and 
  2.) 
  But 
  in 
  the 
  " 
  primary 
  " 
  bands 
  

   of 
  the 
  outward 
  silver 
  diffusion 
  the 
  precipitate 
  is 
  made 
  up 
  of 
  

   exceedingly 
  numerous 
  and 
  very 
  small 
  granules. 
  In 
  watching 
  

  

  