3. "The shampooers spend eight hours daily in the steam; they undergo great labour there, shampooing, perhaps, a dozen persons, and are remarkably healthy. They enter the bath at eight years of age: the duties of the younger portion are light, and chiefly outside in the hall to which the bathers retire after the bath; still, there they are from that tender age exposed to the steam and heat, so as to have their strength broken, if the bath were debilitating. The best shampooer under whose hands I have ever been, was a man whose age was given me as ninety, and who, from eight years of age, had been daily eight hours in the bath. This was at the natural baths of Sophia. I might adduce in like manner the sugar-bakers of London, who, in a temperature not less than that of the bath, undergo great fatigue, and are also remarkably healthy." THE MEDICAL PROPERTIES of the bath are based upon its powers of altering the chemical and electrical conditions of the organic structures of the body and abstracting its fluids. The whole of these changes take place simultaneously, and no doubt harmoniously; but in certain instances we may rely upon a greater activity of one of these processes over the other two: for example, in neuralgia, the electrical power should preponderate; in the destruction of miasma and poisonous ferments, the chemical power; and in the slow removal of accumulated morbid deposits, as in chronic gout and rheumatism, the fluid abstracting power. The required greater activity of one or other of these powers would also be our guide to those physical conditions of the bath which are calculated to effect these objects--for example, temperature and moisture. The temperature and degree of moisture for the treatment of disease must be different from that which is suitable to health. It may be necessary to have recourse to very high temperatures; or it may be requisite to fall below the healthy standard. Moreover, the healthy standard itself may require variation for different individuals and different constitutions. The physician is perfectly conversant with this necessity of adapting his means to the special constitution or idiosyncrasy of his patient.