"All day we kept passing trees or rocks on which were placed little heaps of stones or bits of wood; in passing these, each of my men added a new stone or bit of wood, or even a tuft of grass. This is a tribute to the spirits, the general precaution to insure a safe return. These people have a vague sort of Supreme Being called Lesa, who has good and evil passions; but here (Plateau of Lake Tanganyika), as everywhere else, the Musimo, or spirits of the ancestors, are a leading feature in the beliefs. They are propitiated, as elsewhere, by placing little heaps of stones about their favorite haunts. At certain periods of the year the people make pilgrimages to the mountain of Fwambo-Liamba, on the summit of which is a sort of small altar of stones. There they deposit bits of wood, to which are attached scraps of calico, flowers, or beads; this is to propitiate Lesa. "After harvest, for instance, they make such an offering. So when a girl becomes marriageable, she takes food with her, and goes up to the mountain for several days. When she returns, the other women lead her in procession through the villages, waving long tufts of grass and palms."[34] (2) Other gifts are supposed to be actually utilized by the spirit in some essential way. In some part of the long single street of most villages is built a low hut, sometimes not larger than a dog-kennel, in which, among all tribes, are hung charms; or by which is growing a consecrated plant (a lily, a cactus, a euphorbia, or a ficus). In some tribes a rudely carved human (generally female) figure stands in that hut, as an idol. Idols are rare among most of the coast tribes, but are common among all the interior tribes. That they are not now frequently seen on the Coast is, I think, not due to a lack of faith in them, but perhaps to a slight sense of civilized shame. The idol has been the material object most denounced by missionaries in their sermons against heathenism. The half-awakened native hides it, or he manufactures it for sale to curio-hunters. A really valued idol, supposed to contain a spirit, he will not sell. He does not always hide his fetich charm worn on his person; for it passes muster in his explanation of its use as a "medicine." That idol, charm, or plant, as the case may be, is believed for the time to be the residence of a spirit which is to be placated by offerings of some kind of food. I have seen in those sacred huts a dish of boiled plantains (often by foreigners miscalled "bananas") or a plate of fish. This food is generally not removed till it spoils. Sometimes, where the gift is a very large one, a feast is made; people and spirit are supposed to join in the festival, and nothing is left to spoil. That it is of use to the spirit is fully believed; but just how, few have been able to tell me. Some say that the "life" or essence of the food has been eaten by the spirit; only the form of the vegetable or flesh remaining to be removed.