The adoration of streams, springs, and lakes, or rather of the spirits their rulers, prevailed everywhere; sometimes avowedly because they provided food, as was the case with the Moxos, who called themselves children of the lake or river on which their village was, and were afraid to migrate lest their parent should be vexed;[124-1] sometimes because they were the means of irrigation, as in Peru, or on more general mythical grounds. A grove by a fountain is in all nature worship the ready-made shrine of the sylphs who live in its limpid waves and chatter mysteriously in its shallows. On such a spot in our Gulf States one rarely fails to find the sacrificial mound of the ancient inhabitants, and on such the natives of Central America were wont to erect their altars (Ximenes). Lakes are the natural centres of civilization. Like the lacustrine villages which the Swiss erected in ante-historic times, like ancient Venice, the city of Mexico was first built on piles in a lake, and for the same reason--protection from attack. Security once obtained, growth and power followed. Thus we can trace the earliest rays of Aztec civilization rising from lake Tezcuco, of the Peruvian from Lake Titicaca, of the Muyscas from Lake Guatavita. These are the centres of legendary cycles. Their waters were hallowed by venerable reminiscences. From the depths of Titicaca rose Viracocha, mythical civilizer of Peru. Guatavita was the bourne of many a foot-sore pilgrim in the ancient empire of the Zac. Once a year the high priest poured the collective offerings of the multitude into its waves, and anointed with oils and glittering with gold dust, dived deep in its midst, professing to hold communion with the goddess who there had her home.[125-1] Not only does the life of man but his well-being depends on water. As an ablution it invigorates him bodily and mentally. No institution was in higher honor among the North American Indians than the sweat-bath followed by the cold douche. It was popular not only as a remedy in every and any disease, but as a preliminary to a council or an important transaction. Its real value in cold climates is proven by the sustained fondness for the Russian bath in the north of Europe. The Indians, however, with their usual superstition attributed its good effects to some mysterious healing power in water itself. Therefore, when the patient was not able to undergo the usual process, or when his medical attendant was above the vulgar and routine practice of his profession, it was administered on the infinitesimal system. The quack muttered a formula over a gourd filled from a neighboring spring and sprinkled it on his patient, or washed the diseased part, or sucked out the evil spirit and blew it into a bowl of water, and then scattered the liquid on the fire or earth.[125-2]