﻿Derby 
  — 
  Constituents 
  of 
  the 
  Canon 
  Diablo 
  Meteorite. 
  105 
  

  

  This 
  composition 
  agrees 
  very 
  nearly 
  with 
  that 
  of 
  the 
  " 
  zackige 
  

   Stiicke" 
  of 
  Toluca 
  given 
  by 
  Cohen, 
  and 
  like 
  that 
  shows 
  a 
  higher 
  

   proportion 
  of 
  iron 
  and 
  a 
  lower 
  proportion 
  of 
  nickel 
  and 
  cobalt 
  

   than 
  the 
  general 
  mass 
  of 
  the 
  meteorite 
  and 
  of 
  normal 
  kamacite. 
  

   The 
  occurrence 
  of 
  rhabdite 
  is 
  not 
  noted 
  in 
  the 
  case 
  of 
  Toluca 
  

   but 
  may 
  perhaps 
  be 
  presumed 
  from 
  the 
  relatively 
  high 
  percen- 
  

   tage 
  of 
  phosphorus. 
  

  

  The 
  non-magnetic 
  residue 
  consisted 
  mainly 
  of 
  rust 
  particles 
  

   and 
  some 
  dirt 
  evidently 
  derived 
  from 
  laboratory 
  dnst. 
  Noth- 
  

   ing 
  of 
  any 
  interest 
  that 
  could 
  be 
  referred 
  to 
  the 
  meteorite 
  

   could 
  be 
  detected 
  in 
  it 
  by 
  microscopic 
  examination. 
  

  

  The 
  small 
  jagged 
  pieces 
  were 
  dissolved 
  in 
  copper-ammonium 
  

   chloride 
  with 
  the 
  view 
  of 
  determining 
  the 
  amount 
  of 
  carbon 
  

   but 
  owing 
  to 
  an 
  accident 
  this 
  determination 
  was 
  lost, 
  and 
  only 
  

   the 
  relative 
  proportion 
  of 
  granular 
  (1*84 
  per 
  cent) 
  and 
  of 
  acicu- 
  

   lar 
  (1*16 
  per 
  cent) 
  schreibersite 
  was 
  determined. 
  The 
  amount 
  

   of 
  the 
  coaly 
  residue 
  was 
  apparently 
  greater 
  than 
  with 
  the 
  treat- 
  

   ment 
  with 
  acid. 
  The 
  higher 
  proportion 
  of 
  schreibersite 
  may 
  

   be 
  referred 
  in 
  part 
  to 
  the 
  slighter 
  action 
  of 
  the 
  solvent, 
  by 
  

   which 
  more 
  of 
  the 
  original 
  content 
  is 
  recovered, 
  but 
  it 
  is 
  also 
  

   evident 
  that 
  this 
  mineral, 
  particularly 
  in 
  the 
  acicular 
  form 
  of 
  

   rhabdite, 
  is 
  more 
  abundant 
  than 
  in 
  the 
  generality 
  of 
  the 
  mete- 
  

   oric 
  mass. 
  

  

  An 
  analysis 
  of 
  taenite, 
  which 
  was 
  dissolved 
  in 
  copper- 
  

   ammonium 
  chloride, 
  gave 
  : 
  

  

  Schreibersite 
  T65 
  

  

  Fe._ 
  66*46 
  

  

  M___ 
  30-28 
  

  

  Co 
  ._ 
  0-68 
  

  

  Cu 
  _ 
  _.. 
  0-32 
  

  

  P 
  ._ 
  0-30 
  

  

  99-69 
  

  

  In 
  composition 
  as 
  well 
  as 
  in 
  physical 
  aspect 
  (thin, 
  tin-white 
  

   flexible 
  lamellae) 
  this 
  agrees 
  very 
  closely 
  with 
  the 
  group 
  rich 
  

   in 
  nickel 
  and 
  free 
  from 
  carbon 
  of 
  Toluca, 
  Wichita, 
  etc. 
  as 
  

   given 
  by 
  Cohen. 
  With 
  Toluca 
  also 
  it 
  agrees 
  in 
  the 
  presence 
  

   of 
  a 
  determinable 
  amount 
  of 
  copper. 
  The 
  phosphorus 
  of 
  the 
  

   above 
  analysis 
  indicates, 
  as 
  Prof. 
  Cohen 
  has 
  already 
  remarked, 
  

   that 
  schreibersite 
  is 
  not 
  wholly 
  insoluble 
  in 
  the 
  Cu-Am 
  chlo- 
  

   ride. 
  

  

  Two 
  analyses 
  of 
  cohenite 
  were 
  made, 
  No. 
  I 
  being 
  the 
  free 
  

   grains 
  from 
  the 
  general 
  solution 
  of 
  the 
  mass 
  and 
  ]So. 
  II 
  the 
  

   vein 
  matter. 
  Both 
  were 
  dissolved 
  in 
  copper-ammonium 
  chlo- 
  

   ride 
  and 
  the 
  percentages 
  calculated 
  for 
  the 
  difference 
  in 
  

   weight 
  after 
  deducting 
  the 
  considerable 
  residue 
  of 
  undissolved 
  

  

  