Dryness of the skin is a regular symptom of fever. The most frequent exception to it is in the febrile state of inflammatory rheumatism; in which the skin, while hot, is sometimes quite moist. Generally, the dryer the skin, the worse; the coming of moisture shows the subsidence of the fever. The high heat and dryness are connected together. Reduce the temperature, and perspiration will break out. Therefore, the cold drinks and (careful) cold washing and sponging, spoken of as appropriate to lower the excessive temperature, will serve also to restore the secretion from the skin. Citrate of potassium, acetate of ammonium, and some other medicines favor this effect.

Diuretics are agents which tend to in crease the action of the kidneys, the flow of urine. They are among the more uncertain remedies; they do not always act as we wish them to. In this they differ very much from purgative medicines.

The salines already mentioned (citrate of potassium and acetate of ammonium) arc useful as diuretics. So are cream of tartar and sweet spirit of nitre. The latter is very often given in fever, when the amount of urine is small. Do not forget that sometimes, in low fevers, the bladder is full, but the patient cannot empty it. This must be examined into. If there is retention of urine, it must be drawn off with a catheter.