Girls are taught witchcraft when they are young and are married to a bonga husband. Afterwards when they marry a man they still go away and visit the bonga and when they do so they send in their place a bonga woman exactly like them in appearance and voice; so that the husband cannot tell that it is not his real wife. There is however a way of discovering the substitution; for if the man takes a brand from the fire and burns the woman with it, then if it is really a bonga and not his wife she will fly away in a flame of fire.