﻿PLATE 
  CYI.— 
  To 
  face 
  page 
  188. 
  

  

  J. 
  N. 
  Nevius, 
  photo. 
  

   Potsdam 
  Sandstone, 
  Clarkson's 
  Quarry, 
  3 
  Miles 
  South 
  of 
  Potsdam. 
  St. 
  Lawrence 
  Co. 
  

  

  