(M176) The foregoing account, while it applies strictly to one tribe only, may be regarded as typical of the initiation ceremonies performed on young men throughout the tribes of South-Eastern and Central Australia, except that among the Central tribes the practice of knocking out a tooth on these occasions is replaced by the equally mysterious and much severer bodily mutilations of circumcision and subincision, which are not practised by the tribes of the South-East.(603) The instrument whose humming or booming sound accompanies the critical operation of knocking out the tooth of the novice, is the now well-known bull-roarer, which figures in many savage rites of initiation. Its true nature is concealed from the women and uninitiated lads, who are taught to believe that its sonorous and long-drawn notes are the voice of the mythical being, often called Daramulun, who lives in the sky, instituted the rites, and superintends their performance. The hollow roar of the slat of wood, as it is swung round and round, “represents the muttering of thunder, and the thunder is the voice of Daramulun, and therefore its sound is of the most sacred character. Umbara once said to me, ‘Thunder is the voice of him (pointing upward to the sky) calling on the rain to fall and make everything grow up new.’ ”(604) This supposed resemblance of the sound to thunder probably explains a certain use which the Dieri, a tribe of Central Australia, made of the instrument. When a young man had passed through an initiatory rite, which consisted in cutting a row of gashes in his back, he was given a bull-roarer, and when he went out in search of game, he used to twirl the implement in the belief that by doing so, while his wounds were still unhealed, he created a good harvest of snakes, lizards, and other reptiles, which the natives employ as food; but on the contrary they imagined that these supplies of food would be cut off for ever, if a woman were to see a bull-roarer which had been swung at the rites of initiation.(605) No doubt these savages, living in a parched wilderness where the existence of plants and animals depends on rare and irregular showers,(606) have observed that the fall of rain is regularly followed by a great and sudden increase in the food supply, and that this increase is most marked after violent thunder-storms. Hence by making a noise like thunder with the help of bull-roarers they probably hope, on the principle of imitative magic, to bring on a thunder-storm and with it a fertilizing deluge of rain.