﻿532 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  In 
  case 
  manganese 
  is 
  present, 
  the 
  filtrate 
  from 
  the 
  silica 
  is 
  neu- 
  

   tralized 
  as 
  closely 
  as 
  possible, 
  sodium 
  acetate 
  solution 
  added, 
  the 
  

   solution 
  diluted 
  largely, 
  and 
  boiled 
  for 
  about 
  a 
  minute 
  and 
  filtered 
  

   as 
  rapidly 
  as 
  possible, 
  the 
  precipitate 
  washed 
  with 
  boiling 
  water, 
  

   redissolved 
  in 
  dilute 
  hydrochloric 
  acid 
  and 
  reprecipitated 
  in 
  the 
  

   same 
  way, 
  washed, 
  ignited 
  and 
  weighed 
  as 
  Fe^Og 
  and 
  AlaOg. 
  

   The 
  combined 
  filtrates 
  from 
  the 
  iron 
  and 
  alumina 
  are 
  evaporated 
  

   to 
  about 
  300 
  cc, 
  bromin 
  water 
  added 
  and 
  the 
  solution 
  boiled, 
  when 
  

   the 
  manganese 
  is 
  precipitated 
  as 
  MnO 
  . 
  This 
  is 
  filtered 
  out, 
  dis- 
  

   solved 
  in 
  a 
  little 
  dilute 
  hydrochloric 
  acid, 
  a 
  solution 
  of 
  microcosmic 
  

   salt 
  added, 
  the 
  solution 
  heated 
  to 
  boiling 
  and 
  then 
  ammonia 
  added 
  

   to 
  exact 
  neutrality, 
  any 
  excess 
  of 
  ammonia 
  being 
  removed 
  by 
  heat- 
  

   ing 
  on 
  the 
  water 
  bath. 
  The 
  precipitate 
  of 
  manganese 
  ammonium 
  

   phosphate 
  is 
  filtered 
  out, 
  ignited 
  and 
  weighed 
  as 
  Mn2P2C^7- 
  The 
  

   filtrate 
  from 
  the 
  manganese 
  precipitation 
  is 
  acidified 
  with 
  hydro- 
  

   chloric 
  acid, 
  boiled 
  for 
  a 
  short 
  time, 
  and 
  then 
  treated 
  in 
  the 
  same 
  

   way 
  as 
  when 
  manganese 
  was 
  absent, 
  for 
  the 
  determination 
  of 
  lime 
  

   and 
  magnesia. 
  

  

  For 
  the 
  determination 
  of 
  alkalis 
  one 
  grain 
  of 
  clay 
  is 
  mixed 
  by 
  

   grinding 
  in 
  an 
  agate 
  mortar 
  with 
  one 
  grain 
  of 
  granular 
  ammonium 
  

   chlorid 
  and 
  eight 
  grains 
  of 
  pure 
  calcium 
  carbonate, 
  the 
  mixture 
  

   transferred 
  to 
  a 
  platinum 
  crucible 
  with 
  a, 
  well 
  fitting 
  lid 
  and 
  slowly 
  

   heated 
  to 
  decompose 
  the 
  ammonium 
  chlorid, 
  then 
  heated 
  to 
  redness 
  

   and 
  the 
  bottom 
  of 
  the 
  crucible 
  kept 
  at 
  a 
  bright 
  red 
  for 
  about 
  an 
  

   hour. 
  The 
  contents 
  of 
  the 
  crucible 
  are 
  transferred 
  to 
  a 
  porcelain 
  

   casserole 
  with 
  about 
  80cc 
  of 
  water 
  and 
  heated 
  to 
  boiling; 
  this 
  is 
  

   then 
  filtered 
  and 
  to 
  the 
  filtrate, 
  after 
  evaporation 
  to 
  small 
  bulk, 
  

   about 
  one 
  and 
  one 
  half 
  grams 
  of 
  pure 
  ammonium 
  carbonate 
  is 
  added 
  

   and 
  the 
  solution 
  heated 
  nearly 
  to 
  boiling 
  and 
  filtered 
  into 
  a 
  platinum 
  

   dish, 
  evaporated 
  nearly 
  to 
  dryness, 
  a 
  little 
  more 
  ammonium 
  carbonate 
  

   added 
  and 
  the 
  evaporation 
  finished 
  on 
  the 
  water 
  bath. 
  If 
  the 
  last 
  

   addition 
  of 
  ammonium 
  carbonate 
  produced 
  a 
  precipitate, 
  the 
  residue 
  

   in 
  the 
  dish 
  is 
  dissolved 
  in 
  a 
  little 
  wafer 
  and 
  filtered 
  into 
  another 
  

   platinum 
  dish, 
  where 
  it 
  is 
  evaporated 
  into 
  dryness 
  and 
  ammonia 
  

  

  