﻿PLATE 
  20 
  

  

  To 
  face 
  page 
  643 
  

  

  C. 
  M. 
  Doyle, 
  photo. 
  

  

  Different 
  varieties 
  of 
  brick 
  

  

  1 
  Roman 
  tile. 
  

  

  2 
  Norman 
  tile. 
  

  

  3 
  Dry 
  pressed 
  brick 
  speckled 
  with 
  manganese. 
  

  

  4 
  Rock 
  faced. 
  

  

  