It is seldom that an Indian will voluntarily part with his medicine-bag, and if he does, he forfeits his reputation almost irretrievably. Now and then he is persuaded by the white man to bury it, but its place of interment immediately assumes an air of sanctity in his eyes. He frequents the spot as if drawn thither by an irresistible influence, will throw himself on the sod, and talk to the buried treasure as if it were alive. Sometimes he will offer sacrifices to it, and if he be a rich man, will even offer a horse. On the latter occasion, the whole tribe take part in the ceremony, and march forth to the prairie in picturesque procession, led by the owner of the medicine-bag, who drives before him his most valued and valuable steed, decked with coloured devices. At the appointed spot, he delivers a long prayer or oration to the Great Spirit, and sets free the horse, which thenceforth enjoys the free life of the wild horses of the prairie, and if at any time recaptured is immediately released. The position which in most savage tribes is held by the priest, among the American Indians is held by the “medicine-man.” His influence is considerable, and his powers are supposed to be vast. He is called upon to heal the sick and save the dying, and, above all, to bring down the genial rain from heaven when it is needed for the growth of the crops. We owe to Mr. Catlin an interesting description of the rain-making ceremony. A drought had withered the maize-fields for some weeks, and application for help having been made to the medicine-men they duly set to work. On the first day one Wah-ku, or the Shield, came to the front; but failed--that day an equally unsuccessful experiment was made by Om-pah, or the Elk. The third day was devoted to Wa-rah-pa, or the Beaver, and on the fourth recourse was had to Wak-a-dah-ha-ku, the White Buffalo Hair, who was strong in the possession of a shield coloured with red lightnings, and in the arrow which he carried in his hand. Taking his station by the medicine-lodge, he harangued the people, protesting that for the good of his tribe he was willing to sacrifice himself, and that if he did not bring the much-desired rain, he was content to live for the rest of his life with the old women and the dogs. He asserted that the first medicine-man had failed, because his shield warded off the rain-clouds; the second, who wore a head-dress made of a raven’s skin, because the raven was a bird that soared above the storm, and cared not whether the rain came or stayed; and the third, because the beaver was always wet, and required no rain. But as for him, Wak-a-dah-ha-ku, the red lightnings on his shield would attract the rain-clouds, and his arrow would pierce them, and pour the water over the thirsty fields.