﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  467 
  

  

  The 
  two 
  following 
  analyses 
  kindly 
  furnished 
  the 
  writer 
  by 
  

   G. 
  A. 
  Stone 
  are 
  from 
  the 
  white 
  crystalline 
  limestone 
  outcropping 
  

   at 
  the 
  northern 
  end 
  of 
  Manhattan 
  island: 
  

  

  Silica 
  7.15 
  10.20 
  

  

  Ferric 
  oxid 
  and 
  alumina 
  1 
  . 
  06 
  3 
  . 
  33 
  

  

  Lime 
  39.57 
  27.32 
  

  

  Magnesia 
  10.02 
  17.99 
  

  

  