In this last ceremony the homoeopathic or imitative character of the rite is particularly plain: the shape of the bird which is to be multiplied is mimicked by an effigy, its cry is imitated by the human voice. In others of the ceremonies just described the homoeopathic principle works by means of stones, which resemble in shape the edible animals or plants that the natives desire to increase. We shall see presently that the Melanesians similarly attribute fertilising virtues to stones of certain shapes.​[299] Meantime it {p90} deserves to be noticed that in some of these Australian rites for the multiplication of the totemic animals the blood of the men of the totem plays an important part. Similarly in a ceremony performed by men of the Dieri tribe for the multiplication of carpet-snakes and iguanas the performers wound themselves and the blood that drips from their wounds is poured on a sandhill in which a mythical ancestor is believed to be buried and from which carpet-snakes and iguanas are confidently expected to swarm forth.​[300] Again, when the headman of the fish totem in the Wonkgongaru tribe desires to make fish plentiful, he paints himself all over with red ochre, and, taking little pointed bones, goes into a pool. There he pierces his scrotum and the skin around the navel with the bones, and sits down in the water. The blood from the wounds, as it mingles with the water, is supposed to give rise to fish.​[301] In all these cases clearly a fertilising virtue is ascribed to human blood. The ascription is interesting and may possibly go some way to explain the widely-spread custom of voluntary wounds and mutilations in religious or magical rites. It may therefore be worth while, even at the cost of a digression, to enquire a little more closely into the custom as it is practised by the rude savages of Australia.​[302] [Sidenote: Blood poured into graves. Blood given to the sick and aged Blood used by an avenging party.]