﻿102 
  Derby 
  — 
  Constituents 
  of 
  the 
  Caflon 
  Diablo 
  Meteorite. 
  

  

  individuals, 
  such 
  as 
  in 
  a 
  paper 
  now 
  in 
  press, 
  I 
  have 
  described 
  

   under 
  the 
  name 
  of 
  Wollaston 
  Planes, 
  in 
  the 
  Bendego 
  mass) 
  

   and 
  which, 
  by 
  facilitating 
  fracture 
  either 
  in 
  the 
  original 
  place 
  

   of 
  formation, 
  or 
  in 
  the 
  act 
  of 
  falling, 
  have 
  probably 
  produced 
  the 
  

   approximately 
  plane 
  faces 
  and 
  angular 
  edges 
  that 
  characterize 
  

   that 
  meteorite. 
  Such 
  faces 
  and 
  edges 
  might 
  be 
  expected 
  on 
  

   the 
  Canon 
  Diablo 
  masses 
  on 
  the 
  hypothesis 
  of 
  their 
  being 
  

   fragments 
  of 
  a 
  single 
  homogeneous 
  mass, 
  which 
  seems 
  to 
  be 
  

   required 
  by 
  the 
  conditions 
  under 
  which 
  they 
  were 
  found. 
  A 
  

   rough, 
  jagged 
  and 
  pitted 
  surface 
  is 
  however 
  common 
  to 
  all 
  of 
  

   them, 
  showing 
  a 
  perfect 
  individualization 
  and 
  suggesting 
  on 
  a 
  

   large 
  scale, 
  the 
  small, 
  irregular 
  metallic 
  masses 
  scattered 
  through 
  

   the 
  stony 
  matrix 
  of 
  a 
  mesosiderite. 
  Referring 
  them 
  to 
  a 
  single 
  

   original 
  mass, 
  the 
  hypothesis 
  may 
  be 
  ventured 
  that, 
  on 
  its 
  

   arrival 
  in 
  our 
  atmosphere, 
  this 
  was 
  not 
  homogeneous 
  but 
  con- 
  

   sisted 
  of 
  a 
  large 
  mesosiderite 
  with 
  unusually 
  large 
  metallic 
  

   nodules 
  that 
  became 
  separated 
  by 
  the 
  explosions 
  attending 
  the 
  

   fall, 
  and 
  probably 
  also 
  by 
  subsequent 
  decay 
  and 
  disaggrega- 
  

   tion 
  of 
  the 
  stony 
  matrix.* 
  

  

  After 
  freeing 
  the 
  specimen 
  as 
  far 
  as 
  practicable 
  from 
  its 
  rust 
  

   crusts 
  by 
  scraping 
  after 
  a 
  soaking 
  in 
  strong 
  acid, 
  it 
  was 
  treated 
  

   with 
  cold 
  hydrochloric 
  acid 
  of 
  a 
  strength 
  of 
  1 
  to 
  10. 
  The 
  

   solution 
  was 
  effected 
  slowly 
  with 
  evolution 
  of 
  gas 
  and 
  a 
  separa- 
  

   tion 
  of 
  a 
  variety 
  of 
  grains 
  with 
  a 
  metallic 
  aspect 
  and 
  of 
  a 
  light, 
  

   black 
  residue 
  resembling 
  coal 
  dnst. 
  A 
  vein-like 
  mass 
  some 
  

   three 
  millimeters 
  thick, 
  that 
  showed 
  through 
  the 
  rust 
  crust 
  

   with 
  the 
  appearance 
  of 
  the 
  pencil-like 
  inclusions 
  of 
  troilite 
  in 
  

   the 
  Bendego 
  meteorite, 
  extended 
  for 
  about 
  a 
  centimeter 
  into 
  

   the 
  mass 
  and 
  not 
  being 
  acted 
  upon 
  by 
  the 
  acid, 
  came 
  away 
  in 
  

   fragments. 
  After 
  fourteen 
  weeks 
  of 
  treatment 
  with 
  frequent 
  

   changes 
  of 
  acid, 
  the 
  action 
  almost 
  ceased 
  although 
  a 
  consider- 
  

   able 
  mass 
  still 
  remained 
  undissolved. 
  This 
  had 
  much 
  the 
  

   shape 
  and 
  appearance 
  of 
  the 
  original 
  meteorite 
  though 
  much 
  

   more 
  irregular 
  and 
  jagged, 
  and 
  represents 
  a 
  nncleal 
  portion 
  less 
  

   soluble 
  than 
  the 
  generality 
  of 
  the 
  mass. 
  

  

  The 
  undissolved 
  residue 
  was 
  separated 
  by 
  screening 
  through 
  

   fine 
  bolting 
  cloth, 
  sorting 
  under 
  the 
  lens, 
  and 
  with 
  a 
  magnetized 
  

   knife 
  point, 
  into 
  the 
  following 
  groups 
  : 
  vein 
  matter 
  consisting 
  

  

  *I 
  was 
  also 
  shown 
  in 
  Washington 
  schistose 
  masses 
  of 
  iron 
  oxide 
  found 
  in 
  the 
  

   same 
  region, 
  whose 
  connection 
  with 
  the 
  meteorite 
  was 
  considered 
  doubtful. 
  

   These 
  closely 
  resemble 
  the 
  thicker 
  masses 
  of 
  rust 
  crust 
  formed 
  on 
  the 
  Bendego 
  

   meteorite 
  and 
  like 
  it, 
  as 
  is 
  well 
  seen 
  in 
  sections 
  prepared 
  by 
  Mr. 
  Diller, 
  show 
  

   minute 
  particles 
  with 
  a 
  metallic 
  luster 
  which 
  are 
  almost 
  certainly 
  grains 
  of 
  schrei- 
  

   bersite, 
  as 
  that 
  mineral 
  has 
  been 
  separated 
  from 
  the 
  rust 
  crust 
  of 
  both 
  Bendego 
  

   and 
  Sao 
  Francisco 
  do 
  Sul. 
  In 
  view 
  of 
  its 
  occurrence 
  it 
  can 
  hardly 
  be 
  doubted 
  

   that 
  these 
  Canon 
  Diablo 
  specimens 
  are 
  due 
  to 
  secondary 
  alteration 
  of 
  the 
  meteor- 
  

   ite. 
  As 
  the 
  iron 
  masses 
  in 
  general 
  have 
  only 
  a 
  thin 
  rust 
  crust, 
  indicating 
  con- 
  

   siderable 
  resistance 
  to 
  oxidation, 
  it 
  may 
  be 
  suggested 
  that 
  these 
  thicker 
  masses 
  

   of 
  oxide 
  may 
  perhaps 
  come 
  from 
  original 
  pyrite 
  as 
  in 
  the 
  case 
  of 
  Sao 
  Francisco 
  

   do 
  Sul. 
  

  

  

  