At first, the duration of a sea-bath should not exceed three or five minutes, but it may be gradually prolonged to fifteen or twenty minutes. If the patient is very feeble, one or two baths a week are sufficient, and the most robust person should never take more than one a day. They should always be taken in the earlier portion of the day, before breakfast if possible, and _never during digestion_. Before entering this bath, a moderate degree of exercise should always be taken, enough to arouse the vital energies, but not to produce fatigue. Suitably dressed, the patient plunges into the water, in which he remains during the prescribed time. Immediately after emerging from the bath, the patient should be thoroughly dried and dressed and then moderate exercise should be taken to induce reaction. If the reaction is slow, a mild stimulant may be taken and the duration of the bath must be diminished the next time. When sea-bathing is beneficial improvement is soon manifested. The blood becomes richer, the whole system is strengthened and the functions are performed with more regularity. To the rich, sea-bathing is a luxury, but it is a remedy beyond the reach of the poorer classes unless they live near the sea-shore. THE SHOWER BATH produces a shock to the nervous system by suddenly coming in contact with the skin. Numerous streams of cold water fall upon the neck, shoulders, and body of the patient who stands beneath the hose or reservoir. When the patient is plethoric, feeble, or nervous, or when some internal organ is diseased, the cold, shower bath should _not_ be employed. In simple debility unaccompanied by inflammation or symptoms of internal congestion, its use proves advantageous. By moderating the force of the shower, and substituting tepid water, the most delicate persons can endure it and profit thereby. The usual means for inducing a good reaction, friction, and exercise, should be employed. THE DOUCHE BATH consists of a stream of water, dashed or thrown upon the patient from a moderate height or distance, with considerable force. The size, temperature, and force of the stream may be modified to suit the exigencies of the case. It is locally employed as a remedy for sprains, weak or stiff joints, old swellings, etc. The cold, douche bath is more powerful than the shower bath and should be given with the same precautions which govern the application of the latter.