﻿128 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  packed 
  with 
  tiny 
  opaque 
  inclusions, 
  perhaps 
  magnetite, 
  shows 
  an 
  

   occasional 
  pyrite 
  crystal, 
  and 
  frequent 
  irregularly 
  bounded 
  indi- 
  

   viduals 
  of 
  the 
  material 
  that 
  we 
  are 
  assuming 
  to 
  be 
  graphitic. 
  At 
  

   the 
  contacts 
  with 
  limestone 
  inclusions, 
  clear 
  evidence 
  of 
  limestone 
  

   absorption 
  is 
  shown 
  by 
  the 
  production 
  of 
  a 
  zone 
  of 
  mingled 
  ma- 
  

   terial, 
  calcite 
  and 
  glass, 
  the 
  relative 
  proportions 
  of 
  which 
  vary 
  

   with 
  distance 
  from 
  the 
  contact. 
  The 
  glass 
  is 
  lighter 
  in 
  color 
  and 
  

   no 
  longer 
  clear 
  glass, 
  but 
  full 
  of 
  very 
  tiny 
  crystals, 
  often 
  spherulitic, 
  

   which 
  are 
  altogether 
  too 
  tiny 
  for 
  exact 
  determination, 
  but 
  which 
  

   appear 
  to 
  be 
  feldspar. 
  The 
  addition 
  of 
  lime 
  to 
  the 
  melt 
  seems 
  

   to 
  have 
  lowered 
  the 
  temperature 
  of 
  solidification 
  sufficiently 
  to 
  

   permit 
  at 
  least 
  the 
  beginning 
  of 
  feldspar 
  crystallization, 
  while 
  else- 
  

   where 
  the 
  material 
  solidified 
  as 
  glass. 
  This 
  intermediate 
  zone 
  is 
  

   unquestionably 
  one 
  produced 
  by 
  direct 
  solvent 
  attack 
  of 
  the 
  lava 
  

   upon 
  the 
  limestone, 
  and 
  is 
  thus 
  corroborative 
  of 
  the 
  evidence 
  of 
  

   this 
  attack 
  previously 
  given. 
  

  

  The 
  amygdules 
  in 
  the 
  glass 
  have 
  the 
  appearance 
  of 
  small, 
  round, 
  

   black 
  bodies, 
  when 
  whole; 
  when 
  broken 
  across, 
  the 
  interior 
  filling 
  

   is 
  light 
  colored 
  but 
  dull 
  looking 
  and 
  not 
  so 
  white 
  as 
  in 
  the 
  case 
  

   of 
  the 
  amygdules 
  in 
  the 
  balls. 
  The 
  filling 
  is 
  the 
  same 
  in 
  both 
  

   cases, 
  either 
  wholly 
  calcite, 
  or 
  else 
  calcite 
  with 
  some 
  quartz, 
  both 
  

   of 
  fairly 
  coarse 
  grain. 
  

  

  Chemical 
  composition. 
  Since 
  the 
  rock 
  from 
  the 
  centers 
  of 
  the 
  

   large 
  lava 
  balls 
  seemed 
  in 
  quite 
  fresh 
  and 
  unaltered 
  condition, 
  

   except 
  for 
  the 
  olivine, 
  it 
  was 
  confidently 
  expected 
  that 
  a 
  chemical 
  

   analysis 
  would 
  definitely 
  show 
  the 
  composition 
  of 
  the 
  lava, 
  and 
  

   would 
  be 
  attended 
  by 
  no 
  especial 
  difficulty. 
  But 
  analysis 
  devel- 
  

   oped 
  the 
  presence 
  of 
  a 
  considerable 
  amount 
  of 
  carbon 
  in 
  the 
  rock, 
  

   rendering 
  determination 
  of 
  ferrous 
  iron 
  very 
  difficult, 
  and 
  showed 
  

   also 
  the 
  presence 
  of 
  a 
  large 
  quantity 
  of 
  water. 
  This 
  also 
  was 
  

   difficult 
  of 
  exact 
  determination. 
  *But 
  Professor 
  Morley 
  has 
  labored 
  

   indefatigably 
  at 
  the 
  problem. 
  The 
  ferrous 
  iron 
  was 
  finally 
  deter- 
  

   mined 
  by 
  bichromate 
  titration. 
  Professor 
  Morley 
  states 
  that 
  the 
  

   results 
  can 
  not 
  be 
  vouched 
  for 
  to 
  the 
  single 
  drop, 
  as 
  with 
  perman- 
  

   ganate, 
  but 
  that 
  the 
  uncertainty 
  is 
  not 
  great; 
  that 
  he 
  can 
  not 
  hope 
  

   that 
  the 
  accuracy 
  of 
  the 
  three 
  determinations, 
  Fe 
  2 
  O 
  s 
  , 
  FeO 
  and 
  

   H 
  2 
  0+ 
  is 
  as 
  great 
  as 
  that 
  of 
  the 
  others 
  but 
  that 
  he 
  has 
  every 
  reason 
  

   to 
  believe 
  in 
  their 
  reasonable 
  accuracy. 
  Our 
  indebtedness 
  to 
  him 
  

   for 
  the 
  painstaking 
  labor 
  and 
  the 
  eventual 
  very 
  satisfactory 
  result 
  

   is 
  most 
  emphatically 
  expressed. 
  

  

  