﻿Plate 
  90. 
  — 
  Highland 
  industries 
  in 
  the 
  Colonial 
  Period. 
  Top: 
  Working 
  the 
  silver 
  

   mines 
  of 
  Potosi. 
  (After 
  Vanderaa, 
  n. 
  d., 
  vol. 
  32, 
  pi. 
  42 
  b.) 
  Bottom: 
  A 
  sugar 
  

   mill, 
  a 
  mine 
  shaft, 
  and 
  windmills. 
  (After 
  Chatelain, 
  1719, 
  vol. 
  6, 
  map 
  preced- 
  

   ing 
  p. 
  117.) 
  

  

  