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Updated: May 23, 2025
The chief food of the lower orders and slaves is yams and the jatropha, or cassada, of which there are two species commonly known, the jatropha janipha, and the jatropha manihot. The former contains a strong vegetable poison, which is destroyed by boiling; the latter is merely slightly narcotic in its effects, and both are easily converted into wholesome food.
The root of Janipha Manihot, or Manioc-plant, contains a poisonous substance, supposed to be hydrocyanic acid, along with which there is a considerable proportion of starch. The poisonous matter is removed by roasting and washing, and the starch thus obtained is formed into the cassava-bread of tropical countries, and is also occasionally imported into Europe as Brazilian arrow-root.
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