﻿Smithsonian 
  Report. 
  1943. 
  Cook 
  

  

  PLATE 
  1 
  

  

  Castilla 
  Rubber 
  Trees 
  in 
  Forest 
  Formation. 
  

  

  An 
  abandoned 
  Castilla 
  plantation 
  in 
  Panama, 
  with 
  self-sown 
  young 
  trees 
  developing 
  as 
  undergrowth 
  

   th^mbb?rc^be 
  dST 
  may 
  be 
  es,ablishod 
  if 
  mrthods 
  of 
  mechanical 
  extracTfon 
  of 
  

  

  