only means of bringing down the rain. The Swiss missionary who reports this strange superstition has also suggested what appears to be its true explanation. He points out that as the mother of twins is called by the Baronga “the sky,” they probably think that to pour water on her is equivalent to pouring water on the sky itself; and if water be poured on the sky, it will of course drip through it, as through the nozzle of a gigantic watering-pot, and fall on the earth beneath. A slight extension of the same train of reasoning explains why the desired result is believed to be expedited by drenching the graves of twins, who are the Children of the Sky.​[906] Among the Zulus twins are supposed to be able to foretell the weather, and people who want rain will go to a twin and say, “Tell me, do you feel ill to-day?” If he says he feels quite well, they know it will not rain.​[907] The Wanyamwesi, a large tribe of Central Africa, to the south of the Victoria Nyanza, also believe in the special association of twins with water. For amongst them, when a twin is about to cross a river, stream, or lake, he must fill his mouth full of water and spirt it out over the surface of the river or lake, adding, “I am a twin” (_nänä mpassa_). {p269} And he must do the same if a storm arises on a lake over which he is sailing. Were he to omit the ceremony, some harm might befall him or his companions. In this tribe the birth of twins is comparatively common and is attended by a number of ceremonies. Old women march about the village collecting gifts for the infants, while they drum with a hoe on a piece of ox-hide and sing an obscene song in praise of the father. Further, two little fetish huts are built for the twins before their mother’s house, and here people sacrifice for them in season and out of season, especially when somebody is sick or about to go on a journey or to the wars. If one or both twins die, two aloes are planted beside the little fetish hut.​[908] Lastly, the Hindoos of the Central Provinces in India believe that a twin can save the crops from the ravages of hail and heavy rain if he will only paint his right buttock black and his left buttock some other colour, and thus adorned go and stand in the direction of the wind.​[909] [Sidenote: The rain-maker assimilates himself to rain.]