154 BUREAU OF AMERICAN" ETHNOLOGY [bull. 60 



was the most important burden bearer and the mover of the great 

 bodies of stone and wood employed in building and sculpture. No 

 greater marvel is encountered in the history of the race than that 

 of the transportation of the great stones built into the megalithic 

 monuments of Peru and Bolivia and in the sculptured monuments 

 of Central America and Mexico. The devices employed by the 

 aborigines include water craft of simplest construction — rafts, dug- 

 out canoes, balsas, and doubtless skin and bark boats of types known 

 historically. Domestic animals Avere made helpers by the uiore ad- 

 vanced peoples. Dogs dragged the travois of the plains, dogs and 

 caribou drew the sledges of the Arctic, and the llama in Peru had 

 acquired a high degree of importance as a burden bearer. Growing 

 out of the exigencies of transportation were the industries connected 

 wdth road building and the construction of bridges. 



