﻿Plate 
  3. 
  — 
  Lake 
  Titicaca, 
  Bolivia. 
  Top: 
  Balsa 
  in 
  full 
  sail. 
  (Courtesy 
  James 
  

   Sawders.) 
  Bottom: 
  Native 
  community 
  along 
  south 
  shore. 
  (Courtesy 
  Univer- 
  

   sity 
  Museum, 
  Philadelphia.) 
  

  

  