They are, however, unacquainted with the circulation of the blood and with any judicious treatment of internal diseases, for all of which they resort to incantations and drumming. They do, however, indiscriminately use the vapor bath or sweat house for various complaints. This construction is a small lodge thrown over a basketwork of willows stuck in the ground and bent in an oval or round form, the skins well pinned down and every aperture well closed. The doctor after heating some large stones red hot and putting them into the lodge enters with the patient, both entirely naked and taking along a kettle of water and, as usual, his drum. The lodge is then shut tight by the people on the outside. A brisk singing and drumming is kept up in the lodge by the doctor, who at intervals throws water on the stones and steam is raised. A violent heat and perspiration takes place, which they endure as long as they can; as soon as the patient is taken out he is immersed in cold water, which in nine cases out of ten results in his death. In this way the Crow Indians lost nearly 200 persons three years since during a prevailing influenza. The Mandan and Gros Ventres, however, being accustomed to cold bathing from their youth, are said seldom to suffer any inconvenience but often receive benefit from the vapor bath and immediate cold immersion. They have no names for fevers, consumptions, obstructions of the liver, etc., and can not explain further than by pointing out that part of their body which is in a state of pain.