﻿94 
  TWENTY-FIRST 
  REPORT 
  ON 
  THE 
  STATE 
  CABINET. 
  

  

  the 
  mass, 
  and 
  also 
  enclosed 
  small 
  but 
  distinct 
  brown 
  prisms 
  of 
  

   apatite. 
  

  

  On 
  the 
  other 
  hand, 
  a 
  graphite 
  from 
  the 
  third 
  lot 
  of 
  the 
  second 
  

   range 
  of 
  Greiiville, 
  Quebec, 
  closely 
  resembling 
  the 
  last 
  in 
  appear- 
  

   ance, 
  was 
  found 
  to 
  be 
  of 
  great 
  purity. 
  By 
  long 
  continued 
  ignition 
  

   it 
  burned 
  away, 
  leaving 
  only 
  1.27 
  per 
  cent 
  of 
  foreign 
  matter, 
  

   w 
  T 
  hich 
  consisted 
  of 
  small, 
  colorless, 
  brilliant 
  grains, 
  apparently 
  of 
  

   quartz 
  or 
  feldspar, 
  with 
  a 
  minute 
  quantity 
  of 
  fawn-colored 
  ilocculi. 
  

  

  Portions 
  of 
  the 
  specimens 
  of 
  graphite 
  sent 
  from 
  Canada 
  to 
  the 
  

   Exhibition 
  at 
  London 
  in 
  1862, 
  were 
  furnished 
  to 
  Mr. 
  Regnault, 
  the 
  

   eminent 
  French 
  chemist 
  and 
  physicist, 
  who 
  has 
  since 
  made 
  use 
  of 
  

   them 
  in 
  an 
  investigation 
  on 
  the 
  specific 
  heat 
  of 
  this 
  form 
  of 
  car- 
  

   bon. 
  Incidental 
  to 
  this 
  inquiry, 
  they 
  were 
  submitted 
  to 
  a 
  careful 
  

   analysis 
  by 
  Mr. 
  Cloez 
  ; 
  after 
  being 
  calcined 
  to 
  expel 
  any 
  traces 
  of 
  

   moisture, 
  they 
  were 
  burned 
  in 
  a 
  current 
  of 
  dry 
  oxygen 
  and 
  showed 
  

   the 
  fact, 
  already 
  suspected 
  by 
  Regnault, 
  that 
  a 
  portion 
  of 
  hydro- 
  

   gen 
  enters 
  into 
  their 
  composition, 
  and 
  is 
  only 
  separated 
  by 
  pro- 
  

   longed 
  ignition 
  in 
  a 
  current 
  of 
  dry 
  chlorine, 
  which 
  at 
  the 
  same 
  

   time 
  separates 
  the 
  earthy 
  impurities, 
  in 
  the 
  form 
  of 
  chlorids, 
  and 
  

   leaves 
  the 
  graphite 
  an 
  almost 
  chemically 
  pure 
  carbon. 
  The 
  

   analysis 
  of 
  a 
  specimen, 
  probably 
  from 
  the 
  same 
  locality 
  with 
  that 
  

   which 
  gave 
  me 
  1.27 
  per 
  cent 
  of 
  ash, 
  gave 
  to 
  Cloez, 
  carbon, 
  98.56 
  ; 
  

   hydrogen, 
  1.34 
  ; 
  ash, 
  0.20 
  = 
  100.10. 
  Two 
  other 
  specimens 
  of 
  

   Canadian 
  graphite 
  gave 
  him, 
  respectively, 
  12.60 
  and 
  23.40 
  per 
  

   cent 
  of 
  argillaceous 
  ash 
  [Ann, 
  de 
  Chim. 
  et 
  de 
  Phys. 
  [4], 
  vii, 
  450). 
  

  

  The 
  lamellar 
  graphite 
  above 
  noticed, 
  like 
  that 
  of 
  most 
  of 
  the 
  

   similar 
  graphites 
  known 
  in 
  Grenville 
  and 
  the 
  adjacent 
  region, 
  occurs 
  

   in 
  veins 
  traversing 
  the 
  crystalline 
  limestones, 
  which 
  are 
  themselves 
  

   more 
  or 
  less 
  impregnated 
  with 
  graphite. 
  In 
  other 
  cases, 
  how- 
  

   ever, 
  the 
  wall-rock 
  is 
  gneiss, 
  as 
  in 
  Ticonderoga, 
  New 
  York, 
  where, 
  

   in 
  addition 
  to 
  the 
  graphite 
  veins, 
  interstratifieci 
  layers 
  highly 
  charged 
  

   with 
  lamellar 
  crystalline 
  graphite 
  are 
  extensively 
  mined 
  in 
  the 
  

   Laurentian 
  gneiss. 
  A 
  small 
  vein, 
  also 
  in 
  gneiss, 
  occurs 
  near 
  Mud 
  

   Lake, 
  in 
  Loughborough, 
  Ontario. 
  The 
  graphite 
  of 
  the 
  Lauren- 
  

   tain 
  veins 
  is 
  similar 
  in 
  its 
  characters 
  to 
  the 
  crystalline 
  graphites 
  

   of 
  Ceylon, 
  the 
  mineralogical 
  resemblances 
  of 
  whose 
  rocks 
  to 
  the 
  

   Laurentian 
  series 
  we 
  have 
  already 
  pointed 
  out. 
  These 
  graphites 
  

   are 
  distinguished 
  by 
  their 
  highly 
  crystalline 
  texture, 
  their 
  metallic 
  

   gray 
  streak 
  and 
  lustre, 
  and 
  their 
  comparative 
  freedom 
  from 
  ordi- 
  

   nary 
  earthy 
  impurities, 
  although, 
  as 
  we 
  have 
  seen, 
  they 
  may 
  in- 
  

   clude 
  admixtures 
  of 
  carbonate 
  of 
  lime 
  and 
  sulphuret 
  of 
  iron. 
  

  

  