FETICHISM--SOME OF ITS PRACTICAL EFFECTS 239 Depopulation.--Cannibalism.--Secret Societies (Ukuku, Yasi, Mwetyi, Bweti, Indâ, Njembe).--Poisoning for Revenge.-- Distrust.--Jugglery.--Treatment of Lunatics.--The American Negro Hoodoo.--Folk-Lore.