Among the Blackfoot Indians of North America, when a boy reaches puberty he is sent away from his father's lodge in search of a spiritual protector or totem. Seeking a secluded spot, he abstains from food until he is favoured in a dream with a vision of some animal or bird, which is at once adopted by him.[29] This custom obtains with most of the North American tribes. Among these tribes, also, the soothsayer prepares himself by fasting for the ecstatic state in which the spirits give their messages through him. The ordinary member of the tribe who wants anything will fast until he is assured in a dream that it will be granted him. Similarly, the Malay, to procure supernatural intercourse, retires to the jungle and abstains from food. The Zulu doctor prepares for intercourse with the tribal spirits by spare diet or solitary fasts. Fasting is part of the ordinary regimen of the Hindu yogi. Of certain Indian tribes we are told that before proceeding on an expedition they "observe a rigorous fast, or rather abstain from every kind of food for four days. In this interval their imagination is exalted to delirium; whether it be through bodily weakness or the natural effect of delirium, they pretend to have strange visions. The elders and sages of the tribe, being called upon to interpret these dreams, draw from them omens more or less favourable to the success of the enterprise; and their explanations are received as oracles, by which the expedition will be faithfully regulated."[30] Amongst the Samoans, when rain was required, the priests blackened themselves all over, exhumed a dead body, took the skeleton to a cave and poured water over it. They had to fast and remain in the cave until it rained. Sometimes they died under the experiment, but they generally chose the showery months for their rain-making.[31] In both the Old and New Testaments fasting figures largely. The encounter of Jesus with Satan is preceded by a forty days' fast. St. Catherine of Sienna began regular fasts at a very early age. Santa Teresa kept lengthy fasts every year. The fasting of the monks and nuns during the epidemic period of monasticism is too well known to call for more than a mere reference. Perhaps the most curious religious reason given for fasting is that cited by a writer from a monkish chronicler:-- "As a coach goes faster when it is empty, a man by fasting can be better united to God; for it is a principle with geometers that a round body can never touch a plane except in one point.... A belly too well filled becomes round, it cannot touch God except in one point; but fasting flattens the belly until it is united with the surface of God at all points."[32]