The Bushmen of the northern part of the Kalahari were seen applying the entrails of a small caterpillar which they termed 'Nga to their arrows.

This venom was declared to be so powerful in producing delirium, that a man in dying returned in imagination to a state of infancy, and would call for his mother's breast.

Lions when shot with it are said to perish in agonies.

The poisonous ingredient in this case may be derived from the plant on which the caterpillar feeds.

It is difficult to conceive by what sort of experiments the properties of these poisons, known for generations, were proved.