﻿166 
  W. 
  R. 
  Weed 
  — 
  Gold-hearing 
  Hot 
  Spring 
  Deposit. 
  

  

  reaching 
  to 
  a 
  considerable 
  elevation 
  it 
  would 
  be 
  desirable 
  to 
  

   make 
  the 
  direction 
  of 
  the 
  slit 
  coincide 
  with 
  the 
  direction 
  of 
  

   the 
  longest 
  axis 
  of 
  the 
  prominence, 
  the 
  direct 
  light 
  from 
  the 
  

   limb 
  being 
  excluded 
  by 
  a 
  small 
  strip 
  of 
  metal, 
  sliding 
  under 
  

   the 
  slit. 
  To 
  overcome 
  all 
  of 
  these 
  difficulties 
  I 
  have 
  devised 
  a 
  

   new 
  form 
  of 
  apparatus, 
  which 
  will 
  much 
  excel 
  the 
  rotating 
  

   cylinder 
  in 
  ease 
  of 
  adjustment, 
  and 
  allow 
  the 
  use 
  of 
  ordinary 
  

   glass 
  plates, 
  instead 
  of 
  the 
  celluloid 
  film, 
  which 
  decomposes 
  if 
  

   kept 
  for 
  any 
  length 
  of 
  time. 
  A 
  new 
  form 
  of 
  clepsydra, 
  of 
  

   much 
  larger 
  size 
  and 
  with 
  an 
  improved 
  valve, 
  will 
  replace 
  the 
  

   smaller 
  one 
  before 
  used. 
  The 
  equatorial 
  is 
  also 
  to 
  be 
  supplied 
  

   with 
  a 
  12 
  inch 
  photographic 
  object 
  glass, 
  and 
  a 
  new 
  tube 
  

   parallel 
  to 
  the 
  old 
  one, 
  so 
  that 
  by 
  a 
  suitable 
  form 
  of 
  cell, 
  

   either 
  object 
  glass 
  may 
  readily 
  be 
  used 
  on 
  either 
  tube, 
  as 
  the 
  

   spectroscope 
  is 
  too 
  large 
  and 
  heavy 
  to 
  be 
  easily 
  moved. 
  The 
  

   instrument 
  will 
  also 
  allow 
  eye 
  observations 
  through 
  the 
  C 
  line 
  

   to 
  be 
  made 
  at 
  the 
  same 
  instant 
  that 
  a 
  photograph 
  is 
  exposed 
  

   through 
  H 
  and 
  K, 
  and 
  this 
  will 
  be 
  important 
  in 
  comparisons 
  

   of 
  the 
  form 
  and 
  extent 
  of 
  prominences 
  as 
  observed 
  through 
  

   different 
  lines. 
  

  

  Since 
  the 
  above 
  article 
  was 
  put 
  in 
  type, 
  it 
  has 
  been 
  decided 
  to 
  add 
  another 
  

   illustration 
  (figure 
  4), 
  which 
  shows 
  a 
  much 
  larger 
  prominence, 
  and 
  of 
  such 
  

   peculiar 
  shade 
  as 
  to 
  be 
  particularly 
  interesting. 
  The 
  following 
  is 
  the 
  record 
  

   made 
  on 
  the 
  observatory 
  journal: 
  "Chicago, 
  July 
  8, 
  1891, 
  23 
  hours 
  45 
  minutes, 
  

   prominence 
  through 
  H 
  and 
  K. 
  As 
  at 
  first 
  seen 
  prominence 
  was 
  low, 
  changed 
  

   rapidly. 
  A 
  great 
  flame 
  shot 
  out 
  of 
  the 
  center 
  about 
  80,000 
  miles 
  high 
  and 
  lasted 
  

   about 
  fifteen 
  minutes 
  when 
  it 
  resumed 
  its 
  first 
  shape." 
  As 
  shown 
  in 
  the 
  figure, 
  

   a 
  low 
  portion 
  of 
  the 
  prominence 
  is 
  seen 
  near 
  the 
  limb 
  of 
  the 
  sun. 
  This 
  was 
  

   what 
  was 
  first 
  observed. 
  The 
  high 
  portion 
  lasted 
  only 
  about 
  fifteen 
  minutes 
  and 
  

   then 
  the 
  prominence 
  returned 
  to 
  its 
  original 
  form 
  as 
  shown 
  on 
  the 
  low 
  portion 
  of 
  

   the 
  negative. 
  

  

  Brooklyn, 
  July 
  6, 
  1891. 
  

  

  Art. 
  XY. 
  — 
  A 
  Gold-bearing 
  Hot 
  Spring 
  Deposit 
  ; 
  by 
  

   Walter 
  Harvey 
  Weed. 
  

  

  A 
  FEW 
  months 
  ago, 
  a 
  suite 
  of 
  specimens 
  from 
  the 
  Mount 
  

   Morgan 
  gold 
  mine, 
  of 
  Queensland, 
  Australia, 
  was 
  received 
  by 
  

   the 
  writer 
  from 
  Dr. 
  R. 
  L. 
  Jack, 
  the 
  government 
  geologist 
  of 
  

   Queensland, 
  accompanied 
  by 
  the 
  request 
  that 
  they 
  might 
  be 
  

   examined 
  and 
  compared 
  with 
  the 
  siliceous 
  sinters 
  from 
  the 
  hot 
  

   spring 
  region 
  of 
  the 
  Yellowstone 
  Park. 
  These 
  specimens 
  

   possess 
  unusual 
  interest, 
  since 
  Dr. 
  Jack's 
  observations 
  show 
  

   that 
  this 
  remarkable 
  mine, 
  which 
  paid 
  a 
  dividend 
  of 
  £1,200,000 
  

   sterling, 
  in 
  1889, 
  is 
  the 
  deposit 
  of 
  a 
  hot 
  spring, 
  the 
  ore 
  being 
  

   a 
  siliceous 
  sinter 
  impregnated 
  with 
  auriferous 
  hematite. 
  The 
  

   structure 
  of 
  this 
  ore-body, 
  as 
  developed 
  by 
  the 
  working 
  of 
  the 
  

  

  