Before proceeding farther, it will be proper to explain that the transition from a hot bath to a cold one, even in a state of perspiration, is not half so dangerous as most people imagine. It is well known that if we jump out of hot water into cold, we resist the shock, and bear the effects of the latter better than if we took the plunge without any preparation. But then there is a strong prejudice that _perspiration_ is an insuperable bar to the application of cold water to the surface. If the individual has come into a state of perspiration from bodily exercise, and especially if he be fatigued or exhausted—then the cold water would be dangerous. But this is not the case, to any extent, when he is warmed either by the hot bath, or by the accumulation of heat generated in his own body. This is proved by authentic facts which have come under my own observation. Forty years ago, when the Russian troops were encamped in the islands of Guernsey and Jersey, the soldiers constructed rude stone huts or ovens along the beech, for vapour baths. Into these they put stones, and heated them by fire, when they poured water over them, and thus filled the hut with a dense vapour. When the men had continued in this rude vapour-bath till they were in a state of perspiration, they leaped into the sea, and swam about till they were tired. All this was done, partly for health, partly for pleasure. It is well-known to all northern travellers that the Russians are in the habit of steaming themselves in the vapour-baths, and then directly rolling themselves in the snow. Every one, too, must have observed postillions dashing their foaming and perspiring horses into any convenient water at the end of their journey, without the least fear of their animals being injured by the dip.