As regards the use of the foot bath, we may observe that the theory of its administration subverts all our preconceived notions respecting the proper mode of treating those affections for which it is usually prescribed. For instance, the old mode of proceeding in affections of blood to the head, or in cases of cold feet, was to apply cold to the head and warmth to the feet, in the shape of hot flannels, hot bricks, and hot stupes. Now the Hydropathic mode of treatment is the very reverse of this, viz., to bathe the head in tepid, and place the feet in cold water to about the depth of three inches, up to the ankles—friction of the feet accompanying their immersion; the whole being continued for about ten minutes. Let any person suffering from cold feet try this remedy, and he will satisfy himself of the truth of the principles which enjoin it. Its rationale is as follows:—The application of warm water to the head, of the same temperature as the body, does not increase the flow of blood to it, whilst the subsequent evaporation from the moist and warm surface of the head cools it gradually, and so diminishes the flow of blood to it, whilst the cold application to the feet, has, “for a secondary result, the attraction and retention in those parts of great quantity of blood, and consequently of increased temperature there. In fact,” continues Dr. Gully, “a cold foot bath of twelve or fifteen minutes, followed by a walk of half-an-hour, is the most certain way to warm the feet that can be devised; just as, per contra, the most certain way to insure cold feet, is to soak them in hot water. The same applies to the hands. When the patient is in a condition to take it, a walk is necessary to obtain the circulating reaction alluded to:” he adds, “the warmth remains for several hours. Very frequently I have heard persons say that they have not known cold feet since they began to take cold foot baths.”