﻿Clarke 
  and 
  Steiger 
  — 
  Experiments 
  with 
  Pectolite^ 
  etc. 
  253 
  

  

  chloride 
  were 
  several 
  times 
  determined 
  ; 
  and 
  the 
  following 
  

   percentages, 
  still 
  reckoned 
  on 
  the 
  original 
  mineral, 
  were 
  found 
  : 
  

  

  NHs. 
  H,0. 
  

  

  In 
  B 
  

  

  " 
  C 
  

   « 
  D. 
  

  

  

  2-03 
  

  

  ..._ 
  2-19 
  

   ... 
  2-36 
  

   _.. 
  2-35 
  

  

  2-25 
  

   2-00 
  

   1-89 
  

  

  (( 
  (( 
  

  

  

  _._ 
  2-06 
  

  

  

  

  Mean 
  

  

  

  

  

  ._- 
  2-20 
  

  

  2-04 
  

  

  Correcting 
  the 
  ammonia 
  for 
  the 
  0*li 
  of 
  NH^Cl 
  found 
  in 
  D, 
  

   the 
  mean 
  value 
  becomes 
  2'15. 
  This 
  permanent 
  ammonia 
  is 
  

   not 
  given 
  off 
  upon 
  warming 
  the 
  material 
  with 
  caustic 
  soda 
  

   solution 
  ; 
  and 
  is 
  therefore 
  not 
  present 
  as 
  a 
  salt. 
  The 
  deter- 
  

   minations 
  of 
  it 
  were 
  made 
  bv 
  three 
  distinct 
  methods, 
  and 
  there 
  

   is 
  no 
  possible 
  doubt 
  as 
  to 
  its 
  presence 
  and 
  character. 
  

  

  The 
  composition 
  of 
  the 
  analcite 
  after 
  the 
  treatment 
  with 
  

   ammonium 
  chloride 
  may 
  now 
  be 
  considered, 
  with 
  the 
  sub- 
  

   joined 
  combination 
  of 
  the 
  data. 
  The 
  ]^aCl 
  in 
  A, 
  11-50 
  per 
  

   cent, 
  was 
  in 
  material 
  which 
  had 
  gained 
  2*18 
  per 
  cent, 
  and 
  is 
  

   subject 
  to 
  a 
  correction 
  which 
  reduces 
  the 
  figure 
  to 
  11 
  '26. 
  In 
  

   B, 
  C, 
  and 
  D 
  the 
  corresponding 
  correction 
  is 
  so 
  small 
  that 
  it 
  

   may 
  be 
  neglected. 
  The 
  last 
  cohimn 
  gives 
  the 
  composition 
  of 
  

   the 
  leached 
  residue, 
  recalculated 
  to 
  100 
  per 
  cent, 
  after 
  deduc- 
  

   tion 
  of 
  JS'aCl 
  and 
  the 
  soluble 
  silica. 
  The 
  letters 
  refer 
  back 
  to 
  

   the 
  several 
  experiments, 
  and 
  the 
  little 
  iron 
  is 
  included 
  with 
  

   the 
  alumina. 
  

  

  A. 
  B. 
  C. 
  D. 
  Average. 
  Residue. 
  

  

  SolSiO,... 
  1-20 
  2-03 
  1-61 
  

  

  Insol. 
  SiO^ 
  54-96 
  54*96 
  62-59 
  

  

  A1^03.... 
  21-3'7 
  21-37 
  24-34 
  

  

  CaO 
  -16 
  -16 
  -18 
  

  

  NaCl 
  11-26 
  10-50 
  9-57 
  10-44 
  

  

  Na,0 
  7-12 
  7-12 
  8-11 
  

  

  NH3.. 
  2-03 
  2-19 
  2-21 
  2-15 
  2-46 
  

  

  HO 
  2-25 
  2-00 
  1-89 
  2-04 
  2*32 
  

  

  99-31 
  99-85 
  lOO'OO 
  

  

  The 
  analcite 
  residue, 
  like 
  the 
  original 
  mineral, 
  is 
  completely 
  

   decomposible 
  by 
  aqueous 
  hydrochloric 
  acid. 
  It 
  may 
  be 
  a 
  mix- 
  

   ture 
  ; 
  but 
  it 
  seems 
  more 
  probable 
  that 
  it 
  is 
  a 
  definite 
  com- 
  

   pound 
  ; 
  for 
  it 
  approximates 
  in 
  composition 
  to 
  the 
  formula 
  

  

  