In the native mind evil, and especially any sort of disease as well as death is due either to beings out of a man's reach (spiritual beings) or to human beings endowed with extraordinary power (witches, sorcerers, operators of black magic).
There are a few cases in which the natives accept the evidence of facts: perhaps the only one in which almost all of them agree is in the case of murder. Should a man be deliberately killed, suspicions of witchcraft are not entertained. But should he be killed by a wild beast while hunting, inquiries may be made as to the indirect cause of his death. It will be asked: who advised him to go hunting? who brought that bad beast on to his path? who caused the hunter to miss it?