102 
SURVIVAL ON LAND AND SEA 
They may be baked or boiled. In baking these tubers the 
natives dig a pit, put in large hard rocks and build a fire. 
When the rocks are hot the food is placed in the pit, on 
green leaves, and the hole is covered with palm or other large 
leaves. Earth is sometimes heaped over the leaves. After 
half an hour or so, depending on the number of stones and 
how thoroughly they were heated, the food is ready to eat. 
Figure 27. — Cassava, or tapioca. See p. 103. 
