﻿Smithsonian 
  Report. 
  1943.— 
  Walke 
  

  

  

  1. 
  Ancient 
  Mud 
  Watchtowers 
  in 
  the 
  Arid 
  Mekong 
  Valley 
  in 
  Yunnan. 
  

  

  Corn 
  has 
  been 
  harvested 
  in 
  the 
  foreground 
  and 
  compost 
  piled 
  for 
  the 
  next 
  crop. 
  Scattered 
  trees, 
  probably 
  

   pines, 
  cover 
  the 
  distant 
  heights. 
  (Photograph 
  by 
  J. 
  F. 
  Rock, 
  © 
  National 
  Geographic 
  Society.) 
  

  

  2. 
  Grasslands 
  of 
  Northeastern 
  Tibet. 
  

  

  An 
  explorer's 
  party 
  resting 
  for 
  lunch. 
  Note 
  the 
  almost 
  complete 
  lack 
  of 
  woody 
  plants. 
  When 
  the 
  spring 
  

   frosts 
  disappear 
  the 
  alpine 
  flowers 
  clothe 
  the 
  hills 
  in 
  a 
  riot 
  of 
  color. 
  (Photograph 
  by 
  F. 
  R. 
  Wulsin, 
  © 
  

   National 
  Geographic 
  Society.) 
  

  

  