The length of time spent in the bath must be regulated: partly by the object to be obtained; partly by the habits of the individual as regards the use of the bath; partly by his strength and powers of constitution; and partly by the temperature of the bath. The _object_ of the bather may be a moderate perspiration, or a thorough sweat; he may desire simply to evaporate from his skin the waste particles that occasion fatigue; or he may wish to distil from his blood the morbid atomies of rheumatism, neuralgia, or gout; he may seek for the after enjoyment which follows upon a day's hunting or shooting; or he may strive to gain the health-giving results of active exercise, for a body that has been immured in committee or in office all the day long. I have shown, in an illustration at p. 78, how the bath may be used for the removal of fatigue, of hunger, the cobwebs of the brain; and how it may be made to fortify the powers of the muscular system and of digestion. The practised bather will know when to cease the bath, without reference to other authority than his own sensations and experience. The weak and the strong must be equally guided by their powers of endurance, and all must be influenced to a greater or less extent by the thermometer. A bath at 180° cannot be borne for the same length of time as a bath at 130°; and it is clear that if a protracted bath be the object sought to be attained, the temperature must be moderate and agreeable to the sensations. In the baths of very high temperature the bather is forced to retreat before a full perspiration is accomplished, and he is therefore rendered liable to a secondary perspiration, which chills the skin and endangers catarrh and other local congestions, while he is deprived of the refreshing and exhilarating sensation which follows a properly-accomplished bath. For him, there is no jumping over a lamp-post, much less "the moon." I have often passed an hour in the bath. Mr. Urquhart, Mr. Holland, and Mr. Witt have spent several consecutive hours in the bath. Mr. Rolland lived in the bath for three days, quitting it only for a short period at a time. To some, a quarter of an hour in the Calidarium would be enough; while others would prefer half or three-quarters of an hour. The Romans indulged in the bath to so great an excess, that it became necessary to pass a law to restrict its use to two hours. Dr. Millingen, Physician to the Sultan, in a letter from Constantinople, addressed to Mr. George Witt, observes:--"If a Moslem enters the bath for the object of a legal ablution, half an hour is amply sufficient; if, however, a person wishes to go through all the stages of a complete bath, an hour, at least, or one hour and a half, is the usual time."