﻿PLATE 
  IV. 
  

  

  J. 
  H. 
  Merrill, 
  Photo. 
  

  

  FORDHAM 
  GNETSS. 
  LekUKGY'S 
  QUARRY, 
  HASTINGS 
  ]^. 
  Y. 
  

  

  Photomicrograph 
  in 
  polarized 
  light, 
  enlargment 
  22 
  diameters. 
  

  

  