Witches are people believed to possess invisible powers, that nobody can explain, to do harm to others. This power is said to be in the heart of one so accused and it is not quite certain whether he knows of it himself. To prove that one is a witch or wizard the root of a certain herb (pwave) is mixed with water in a bowl and given to one to drink of it. If he does not vomit he is said to be a witch, but if he does he is not a witch.