But the chief interest presented by the Wa-Giryama is centred in their religious ideas, which are mainly connected with ancestry-worship, and afford an unexpected insight into the origin and nature of that perhaps most primitive of all forms of belief. There is, of course, a vague entity called a "Supreme Being" in ethnographic writings, who, like the Algonquian Manitu, crops up under various names (here _Mulungu_) all over east Bantuland, but on analysis generally resolves itself into some dim notion growing out of ancestry-worship, a great or aged person, eponymous hero or the like, later deified in diverse ways as the Preserver, the Disposer, and especially the Creator. These Wa-Giryama suppose that from his union with the Earth all things have sprung, and that human beings are Mulungu's hens and chickens. But there is also an idea that he may be the manes of their fathers, and thus everything becomes merged in a kind of apotheosis of the departed. They think "the disembodied spirit is powerful for good and evil. Individuals worship the shades of their immediate ancestors or elder relatives; and the _k'omas_ [souls?] of the whole nation are worshipped on public occasions." Although the European ghost or "revenant" is unknown, the spirits of near ancestors may appear in dreams, and express their wishes to the living. They ask for sacrifices at their graves to appease their hunger, and such sacrifices are often made with a little flour and water poured into a coconut shell let into the ground, the fowls and other victims being so killed that the blood shall trickle into the grave. At the offering the dead are called on by name to come and partake, and bring their friends with them, who are also mentioned by name. But whereas Christians pray to be remembered of heaven and the saints, the Wa-Giryama pray rather that the new-born babe be forgotten of Mulungu, and so live. "Well!" they will say on the news of a birth, "may Mulungu forget him that he may become strong and well." This is an instructive trait, a reminiscence of the time when Mulungu, now almost harmless or indifferent to mundane things, was the embodiment of all evil, hence to be feared and appeased in accordance with the old dictum _Timor fecit deos_.