Thomas Whiffen, The North-West Amazons: Notes of some months spent among cannibal tribes
“ It is when one turns to the vegetable world that one finds the staple food of the Amazonian native. The manioc is to the Indian the chief necessary of life. The sweet manioc, [182] although known to these Issa-Japura tribes, is never planted, because it is not appreciated by them. They prefer the poisonous species which, as its botanical name Manihot utilissima implies, can be put to a multiplicity of uses. To eliminate the poison and render it fit for food, the manioc is subjected to several processes. ”
