﻿128 
  

  

  objections 
  adduces 
  the 
  occurrence 
  of 
  apatite 
  in 
  iron 
  ore, 
  and 
  in 
  gneiss, 
  

   mica-slate, 
  and 
  granite 
  ; 
  in 
  which 
  we 
  have, 
  at 
  least, 
  no 
  evidence 
  that 
  

   these 
  organic 
  structures 
  have 
  existed. 
  Again, 
  the 
  limestones 
  which 
  

   are 
  the 
  richest 
  in 
  phosphate 
  of 
  lime, 
  are 
  always 
  enclosed 
  in 
  granite 
  or 
  

   gneiss. 
  Amer. 
  Quart. 
  Jour., 
  i. 
  p. 
  63, 
  64. 
  

  

  These 
  objections 
  seem 
  to 
  me 
  to 
  be 
  valid. 
  I 
  can 
  see 
  no 
  reason 
  why- 
  

   phosphate 
  of 
  lime, 
  in 
  the 
  form 
  of 
  apatite, 
  may 
  not 
  be 
  an 
  original 
  pro- 
  

   duct, 
  as 
  well 
  as 
  fluor 
  spar, 
  or 
  the 
  magnetic 
  iron 
  ore 
  itself. 
  It 
  is 
  an 
  

   overstrained 
  view, 
  to 
  refer 
  the 
  formation 
  of 
  every 
  mineral 
  to 
  chemical 
  

   action 
  exerted 
  upon 
  some 
  previously 
  existing 
  body. 
  And 
  after 
  all, 
  it 
  

   only 
  removes 
  the 
  difficulty 
  in 
  regard 
  to 
  the 
  formation 
  of 
  these 
  sub- 
  

   stances 
  one 
  step 
  further, 
  for 
  it 
  may 
  be 
  fairly 
  asked, 
  whence 
  the 
  phos- 
  

   phate 
  of 
  lime 
  in 
  the 
  coral 
  was 
  derived 
  ? 
  

  

  FLOUR 
  SPAR. 
  

   (Mineralogy 
  of 
  New- 
  York, 
  page 
  243.) 
  

  

  I 
  have 
  only 
  to 
  add 
  the 
  occurrence 
  of 
  this 
  mineral 
  in 
  small 
  quantities 
  

   in 
  Gouverneur, 
  St. 
  Lawrence 
  county, 
  reported 
  by 
  Dr. 
  Emmons, 
  and 
  

   which 
  had 
  escaped 
  my 
  notice 
  in 
  the 
  explorations 
  which 
  I 
  made 
  in 
  that 
  

   county. 
  See 
  Rep. 
  on 
  the 
  Geol. 
  2d 
  Dist. 
  p. 
  366. 
  

  

  I 
  may 
  also 
  state, 
  as 
  connected 
  with 
  the 
  general 
  history 
  of 
  this 
  mine- 
  

   ral, 
  that 
  it 
  has 
  been 
  found 
  in 
  many 
  of 
  our 
  common 
  waters, 
  and 
  that 
  its 
  

   existence 
  in 
  recent 
  and 
  fossil 
  bones, 
  has 
  been 
  attributed 
  to 
  this 
  source. 
  

   See 
  the 
  papers 
  of 
  J. 
  Middleton, 
  Esq., 
  and 
  of 
  Dr. 
  Daubeny, 
  (Lon. 
  Ed., 
  

   and 
  Dub. 
  Phil. 
  Mag., 
  vol. 
  xxv, 
  p. 
  14 
  and 
  122.) 
  

  

  HYDRAULIC 
  LIMESTONE. 
  

   (Mineralogy 
  of 
  New-York, 
  page 
  256.) 
  

  

  Dr. 
  C. 
  T. 
  Jackson's 
  analysis 
  of 
  the 
  Rosendale 
  hydraulic 
  limestone 
  and 
  

   cement, 
  will 
  be 
  found 
  in 
  the 
  Trans, 
  of 
  the 
  Amer. 
  Ass. 
  of 
  Geologists, 
  

   for 
  1845, 
  p. 
  48. 
  

  

  The 
  following 
  fact, 
  noticed 
  by 
  Bezelius, 
  throws 
  some 
  light 
  upon 
  the 
  

   chemical 
  nature 
  of 
  hydraulic 
  limestones 
  : 
  " 
  When 
  muriatic 
  acid 
  is 
  ad- 
  

   ded 
  to 
  hydraulic 
  mortar, 
  which 
  has 
  been 
  under 
  water 
  three 
  months 
  and 
  

   reduced 
  to 
  powder, 
  it 
  gelatinizes 
  at 
  the 
  end 
  of 
  a 
  (ew 
  minutes. 
  Hence 
  

   it 
  is 
  inferred 
  that 
  there 
  is 
  formed 
  a 
  double 
  silicate 
  of 
  lime 
  and 
  alumina, 
  

   a 
  native 
  zeolite, 
  which 
  gives 
  solidity 
  to 
  the 
  mortar." 
  Berzulius* 
  Ann. 
  

   Report 
  for 
  1844. 
  

  

  