﻿I 
  < 
  

  

  Ponds? 
  Meulen 
  Two 
  So-called 
  Halloysitee. 
  

  

  and 
  many 
  white 
  clays, 
  after 
  washing, 
  closely 
  approximate 
  this 
  

   formula, 
  In 
  the 
  case 
  of 
  the 
  Chattooga 
  clay 
  the 
  high 
  alumina 
  

   content 
  together 
  with 
  the 
  presence 
  01 
  hydrargillite 
  crystals 
  on 
  

   t\\<- 
  surface 
  points 
  strongly 
  toward 
  the 
  probability 
  that 
  it 
  con- 
  

   tains 
  this 
  latter 
  compound. 
  The 
  Nj-i./) 
  might 
  perhaps 
  be 
  con- 
  

   sidered 
  as 
  some 
  nndecomposed 
  mineral 
  such 
  asaibite, 
  or 
  it 
  may 
  

   be 
  there 
  In 
  some 
  other 
  form, 
  Cn 
  any 
  case 
  it 
  Is 
  better 
  to 
  leave 
  

  

  Km;. 
  I. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  /oOO 
  

  

  •too 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  X 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  * 
  

   bl 
  

  

  

  

  Vj 
  

  

  700 
  

  

  III 
  

  

  '■j 
  4,on 
  

  

  V) 
  

  

  •u 
  Goo 
  

  

  \*oo 
  

   K 
  

  

  Is 
  300 
  

  

  

  

  

  

  

  

  

  W 
  

   

  

  M 
  

  

  0/ 
  

   M 
  

  

  

  

  

  

  

  

  

  

  

  7 
  

  

  0/ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  ,Ot> 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  < 
  

  

  » 
  J 
  

  

  4 
  

  

  ' 
  f 
  

  

  ■■ 
  

  

  J 
  /< 
  

  

  3 
  /J 
  

  

  2 
  /- 
  

  

  c 
  

  

  /< 
  

  

  9 
  / 
  

  

  * 
  

  

  O 
  

  

  ii 
  out 
  of 
  consideration, 
  and 
  to 
  assume 
  that 
  the 
  clays 
  are 
  mix- 
  

   tures 
  chiefly 
  of 
  kaolinite 
  and 
  hydrargillite, 
  with 
  lesser 
  amounts 
  

   of 
  other 
  substances. 
  II 
  the 
  relative 
  amounts 
  of 
  these 
  com- 
  

   pounds 
  '"• 
  calculated, 
  the 
  results 
  given 
  below 
  are 
  obtained, 
  

  

  ( 
  lhattooga 
  Alabama 
  

   Olay 
  Clay 
  

  

  Kaolinite 
  . 
  .. 
  77*08$ 
  98*12$ 
  

  

  Hydrargillite 
  .. 
  21*89 
  4*83 
  

  

  water 
  .. 
  0*00 
  1*6] 
  

  

  \\\ 
  employing 
  dilute 
  sulphuric 
  acid 
  at 
  a 
  fairly 
  low 
  tempera- 
  

   ture 
  il 
  wai 
  thought 
  possible 
  to 
  dissolve 
  from 
  suoh 
  mixtures 
  

  

  