﻿H. 
  E. 
  Gregory 
  — 
  La 
  Paz 
  (Bolivia) 
  Gorge. 
  

  

  141 
  

  

  Aet. 
  XVI. 
  — 
  The 
  La 
  Paz 
  (Bolivia) 
  Gorge; 
  by 
  Herbert 
  

  

  E. 
  Gregory.* 
  

  

  From 
  the 
  shores 
  of 
  Lago 
  Pequeno, 
  the 
  nearly 
  enclosed 
  south- 
  

   eastern 
  portion 
  of 
  Lake 
  Titicaca, 
  the 
  surface 
  of 
  the 
  interior 
  

   plateau 
  of 
  Bolivia 
  (the 
  altiplano 
  or 
  altiplctnicie 
  of 
  the 
  Spanish 
  

   Americans) 
  ascends 
  toward 
  the 
  Cordillera 
  Real. 
  From 
  Guaqui 
  

   to 
  Viacha, 
  forty-two 
  miles, 
  the 
  rise 
  is 
  120 
  feet 
  and 
  the 
  railroad, 
  

   after 
  following 
  the 
  irregular 
  course 
  of 
  the 
  Rio 
  Tiahuanaco 
  and 
  

  

  Fig. 
  1. 
  

  

  Fig. 
  1. 
  View 
  from 
  Alto 
  looking 
  eastward 
  toward 
  the 
  Cordillera 
  Eeal. 
  

   The 
  position 
  of 
  the 
  gorge, 
  on 
  the 
  floor 
  of 
  which 
  the 
  city 
  of 
  La 
  Paz 
  rests, 
  is 
  

   indicated 
  by 
  the 
  arrow. 
  

  

  passing 
  a 
  group 
  of 
  low, 
  mature 
  hills, 
  crosses 
  the 
  shallow 
  

   valleys 
  of 
  the 
  Rio 
  Colorado 
  and 
  the 
  Rio 
  Yiacha. 
  From 
  Via- 
  

   cha 
  to 
  Alto, 
  the 
  terminus 
  of 
  the 
  steam 
  railroad, 
  the 
  floor 
  of 
  

   the 
  altiplano 
  is 
  remarkably 
  flat, 
  and 
  slopes 
  westward 
  at 
  the 
  

   rate 
  of 
  forty 
  feet 
  per 
  mile.f 
  The 
  drainage 
  of 
  this 
  portion 
  of 
  

   the 
  plateau 
  is 
  sluggish 
  and 
  frequently 
  interrupted 
  by 
  shallow 
  

  

  * 
  Geologist 
  of 
  the 
  Peruvian 
  Expedition 
  of 
  1912. 
  

  

  f 
  Distances 
  and 
  elevations 
  are 
  as 
  shown 
  on 
  the 
  Mapa 
  General 
  of 
  the 
  Ferro 
  

   Garril 
  del 
  Sur 
  del 
  Pern, 
  a 
  blueprint 
  of 
  which 
  was 
  kindly 
  furnished 
  by 
  T. 
  A. 
  

   Corey, 
  Chief 
  Engineer. 
  

  

  