﻿104 
  Derby 
  — 
  Constituents 
  of 
  the 
  Canon 
  Diablo 
  Meteorite. 
  

  

  as 
  given 
  by 
  Cohen. 
  As 
  the 
  proportion 
  of 
  phosphorus 
  and 
  

   copper 
  is 
  higher 
  than 
  in 
  the 
  greater 
  part 
  of 
  Cohen's 
  analyses* 
  

   in 
  which 
  for 
  the 
  most 
  part 
  weaker 
  acid 
  was 
  employed, 
  it 
  may 
  

   be 
  presumed 
  that 
  the 
  elements 
  rich 
  in 
  nickel, 
  taenite, 
  schrei- 
  

   bersite 
  and 
  the 
  coaly 
  substance, 
  were 
  more 
  strongly 
  attacked, 
  

   giving 
  an 
  enrichment 
  in 
  nickel. 
  Making 
  allowance 
  for 
  this 
  

   circumstance, 
  the 
  dissolved 
  portion 
  may 
  be 
  considered 
  as 
  con- 
  

   sisting 
  essentially 
  of 
  normal 
  kamacite. 
  

  

  The 
  large 
  jagged 
  piece 
  which 
  was 
  only 
  attacked 
  with 
  ex- 
  

   treme 
  slowness 
  by 
  cold 
  acid 
  of 
  a 
  strength 
  of 
  1 
  to 
  10 
  was 
  tried 
  

   with 
  acid 
  1 
  in 
  5 
  without 
  much 
  better 
  results 
  in 
  the 
  cold. 
  On 
  

   heating 
  on 
  the 
  water 
  bath 
  vigorous 
  action 
  commenced 
  and 
  con- 
  

   tinued 
  even 
  after 
  the 
  acid 
  was 
  much 
  diluted. 
  At 
  times 
  the 
  

   action 
  would 
  continue 
  in 
  the 
  cold 
  after 
  removal 
  from 
  the 
  bath, 
  

   at 
  others 
  it 
  would 
  almost 
  cease 
  in 
  the 
  hot 
  acid 
  and 
  only 
  recom- 
  

   mence 
  with 
  vigor 
  on 
  the 
  addition 
  of 
  a 
  considerable 
  quantity 
  of 
  

   fresh 
  acid. 
  At 
  other 
  times 
  the 
  action 
  would 
  continue 
  until 
  

   the 
  acid 
  was 
  completely 
  exhausted 
  and 
  a 
  precipitate 
  began 
  to 
  

   appear 
  in 
  the 
  solution. 
  These 
  variations 
  in 
  the 
  action 
  of 
  the 
  

   acid 
  indicate 
  a 
  lack 
  of 
  homogeneity 
  and 
  varying 
  degrees 
  of 
  

   solubility 
  in 
  different 
  parts 
  of 
  the 
  mass. 
  The 
  residue 
  was 
  

   similar 
  to 
  that 
  of 
  the 
  original 
  mass 
  except 
  that 
  cohenite 
  was 
  

   almost 
  entirely 
  lacking. 
  The 
  principal 
  contrast 
  in 
  the 
  two 
  

   residues 
  was 
  in 
  the 
  greater 
  relative 
  abundance 
  of 
  rhabdite 
  and 
  

   the 
  less 
  abundance 
  of 
  granular 
  schreibersite 
  and 
  of 
  the 
  coaly 
  

   matter 
  in 
  that 
  of 
  the 
  jagged 
  piece. 
  The 
  coaly 
  matter 
  was 
  

   evidently 
  partially 
  destroyed 
  by 
  the 
  action 
  of 
  the 
  hot 
  acid 
  and 
  

   the 
  residue 
  was 
  entirely 
  freed 
  from 
  it 
  by 
  treatment 
  with 
  strong, 
  

   cold 
  acid, 
  a 
  white 
  flocculent 
  skeleton 
  remaining. 
  

  

  The 
  large 
  piece 
  was 
  broken 
  up 
  as 
  follows 
  : 
  

  

  Original 
  specimen 
  ._ 
  „_ 
  9-1855 
  grams 
  

  

  Taenite 
  0*029 
  0*31$ 
  

  

  , 
  ., 
  .. 
  ( 
  granular 
  0*0075 
  0'08$ 
  ) 
  - 
  „ 
  00 
  n 
  oe 
  

  

  Schreibersite 
  .. 
  ■{ 
  & 
  . 
  , 
  ^™ 
  e 
  ~ 
  ^ 
  n 
  * 
  r 
  -- 
  0*033 
  0'35 
  

  

  ( 
  acicular 
  0*025o 
  0*27 
  j 
  

  

  Non-magnetic 
  residue 
  0*325 
  0*34 
  

  

  Dissolved 
  _ 
  _ 
  9 
  094 
  99*00 
  

  

  An 
  analysis 
  of 
  the 
  solution 
  gave 
  the 
  following 
  result 
  (cop- 
  

   per 
  was 
  determined 
  in 
  the 
  whole 
  solution, 
  the 
  other 
  elements 
  

   in 
  100 
  cc 
  :) 
  

  

  Fe 
  94*32 
  

  

  Ni 
  and 
  Co 
  578 
  

  

  P 
  0*15 
  

  

  Cu 
  0*05 
  

  

  100*30 
  

  

  * 
  Annalen 
  d. 
  K. 
  K. 
  naturhistorischen. 
  Hofmuscums, 
  vi, 
  1891, 
  p. 
  131 
  ; 
  vii, 
  1892, 
  

   p. 
  143; 
  ix, 
  1894, 
  p. 
  97. 
  

  

  