﻿H. 
  L. 
  Preston 
  — 
  Illinois 
  Gulch 
  Meteorite.- 
  201 
  

  

  Art. 
  XXI. 
  — 
  Illinois 
  Gulch 
  Meteorite; 
  by 
  H. 
  L. 
  Preston. 
  

  

  [Read 
  before 
  the 
  Rochester 
  Academy 
  of 
  Science, 
  Jan. 
  23d 
  J 
  

  

  The 
  Illinois 
  Gulch 
  siderite 
  was 
  found 
  in 
  Illinois 
  Gulch, 
  

   Deer 
  Lodge 
  County, 
  Montana, 
  in 
  1899, 
  on 
  the 
  bed 
  rock 
  about 
  

   four 
  feet 
  below 
  the 
  surface, 
  by 
  J. 
  Parle 
  while 
  placer 
  mining. 
  

  

  The 
  mass 
  was 
  somewhat 
  ham-shaped, 
  as 
  will 
  be 
  seen 
  by 
  

   the 
  following 
  cut. 
  

  

  Illinois 
  Gulch 
  Meteorite* 
  

  

  Its 
  dimensions 
  are 
  63Xl01Xl0o 
  mm 
  in 
  its 
  greatest 
  diameters. 
  

   There 
  are 
  two 
  rather 
  large 
  typical 
  pittings, 
  one 
  on 
  either 
  side, 
  

   with 
  numerous 
  quite 
  small 
  ones 
  and 
  three 
  sharp 
  angular 
  ridges 
  

   on 
  the 
  upper 
  or 
  necked 
  surface. 
  But 
  little 
  genuine 
  crust 
  is 
  

   left, 
  the 
  bright 
  silvery 
  metallic 
  iron 
  being 
  visible 
  in 
  small 
  

   patches 
  through 
  the 
  oxidized 
  surface, 
  over 
  a 
  portion 
  of 
  the 
  

   mass. 
  

  

  On 
  certain 
  portions 
  of 
  the 
  mass, 
  particularly 
  in 
  the 
  deeper 
  

   pittings, 
  there 
  is 
  quite 
  a 
  thick 
  deposit 
  of 
  carbonate 
  of 
  lime, 
  

   showing 
  that 
  it 
  had 
  lain 
  for 
  a 
  long 
  time 
  in 
  the 
  position 
  where 
  

   found. 
  

  

  In 
  slicing 
  the 
  mass 
  into 
  live 
  sections, 
  the 
  protosulphide 
  of 
  

   iron, 
  troilite, 
  was 
  found 
  only 
  on 
  one 
  section, 
  and 
  on 
  this 
  in 
  

   very 
  small 
  quantities 
  ; 
  the 
  largest 
  nodule 
  being 
  only 
  6 
  ram 
  in 
  

   diameter, 
  with 
  numerous 
  small 
  fissures, 
  from 
  1 
  to 
  5 
  mm 
  in 
  length, 
  

   extending 
  in 
  various 
  directions 
  from 
  it, 
  that 
  are 
  filled 
  with 
  the 
  

   same 
  material. 
  

  

  This 
  nodule 
  occurred 
  in 
  the 
  lower 
  center 
  of 
  the 
  section. 
  At 
  

   the 
  extreme 
  right, 
  within 
  5 
  ,nm 
  of 
  the 
  edge 
  of 
  the 
  section, 
  

   occurred 
  another 
  patch 
  of 
  small 
  h'ssures, 
  covering 
  an 
  area 
  of 
  

   about 
  8 
  mrn 
  in 
  diameter, 
  filled 
  with 
  troilite. 
  

  

  * 
  The 
  horizontal 
  lines 
  on 
  cut 
  are 
  due 
  to 
  the 
  fact 
  that 
  the 
  photograph 
  was 
  taken 
  

   after 
  the 
  mass 
  had 
  been 
  cut. 
  

  

  