Copyright by Underwood Sf Underwood 
Llamas in Cerro de Pasco, Peru, bringing in their burdens of 
copper ore from nearby Indian mines 
u Custom has decreed the exact weight each burro, llama or mule will carry, 
and let me add that these animals know to a nicety their load, and are life 
members of a union that prohibits its initiates from carrying more than is ex 
pected of them.” 
See page j/j