In no ordinary case whatever, is the cold bath useful, unless it is succeeded by that degree of warmth on the surface of the body which is usually called a _glow_. This is a leading and important principle. The contrary, that is, the injurious effects of cold bathing--its _immediate_ bad effects, I mean--are shown by the skin remaining pale and shrivelled after coming out of the bath, by its blue appearance, and by its coldness, as well as by a sunken state of the eyes, and much general languor. To secure this point--I mean the GLOW--it is indispensably important to begin the use of cold water gradually; that is, to use it at first of so high a temperature as to produce only a slight sensation of cold, and to take special care that the skin be immediately wiped very dry, and the temperature of the room be quite as high as usual. Afterward the water may be cooled gradually, from week to week, though never more than a degree or two at once. It will probably be unsafe to commence this practice of cold bathing--even in the case of the most robust children--until they are at least six months of age. The appropriate season will be the middle of the forenoon, the hour when the system is usually the most vigorous, and at which we shall be most likely to secure a reaction. At first, twice or three times a week are as often as it will be safe to repeat it. Some writers recommend it twice a day; but once is enough, under any ordinary circumstances. The method at first is, to give the infant a single plunge. Afterward, when he becomes older, and more inured to it, he may be plunged several times in succession. On taking him out of the bath, the skin should be wiped perfectly dry, as in the case of the warm bath, and with the same or an increased degree of attention to other circumstances--the temperature of the room, the avoiding currents of air, &c. He should next be put in a soft, warm blanket, and be kept for some time in a state of gentle motion; and after a little time, should be dressed. I have already mentioned the importance of avoiding the manifestation of fear, when we bathe a child; and the caution is particularly necessary in the administration of the cold bath. Some writers even recommend, that during the whole process of undressing, bathing, exercising, and dressing, singing should be employed. There is philosophy in this advice, and it is easily tried; but I cannot speak of it from experience. There is one thing which may serve to calm our apprehensions--if we have any--of danger; which is, that though the child's lungs are feeble at first, from their not having been, like the heart, accustomed to previous action, yet when they get fairly into motion and action, and the child is a few months old, they are probably as strong, if not stronger, in proportion, than those of adults.