Sometimes one finds a great prejudice against hot water. You see one who is miserable through derangement of the stomach and digestive organs, and you mention "hot water." The very phrase is sufficient to put an expression of strong prejudice on the face. Yet that very hot water is perhaps the only thing that will cure the patient. If you wait a little, there will be an opening to explain that hot water is very different to tepid water. Under blood heat, and yet heated, water tends to produce vomiting; above blood heat, nothing will so well set the stomach right. This is true, however, only when the water is taken in very small quantities. You must see that the water is not smoked in the heating or otherwise spoiled. And also that it be not too hot. If it scalds the lips it is too hot. When it is comfortably warm, but not tepid, it does its work most effectively. Water for Drinking.--Every care should be taken to have drinking water absolutely pure. Diarrhoea and many infectious diseases may be conveyed by impure water. In gouty cases as much water should be taken as possible (provided the heart is sufficiently strong) in order to wash away the waste matter. The same applies to fevers. If there is a suspicion of water being contaminated mere filtration should never be relied on, the water should be boiled. After many of the treatments given by us in this book, considerable thirst will be experienced. Cold water in such cases may always be given. In fact, in any internal congested condition cold water will stimulate the nerves of these organs, and make them act on the blood vessels. In all cases where drugs, especially mineral drugs have been recklessly indulged in, cold water should be taken in abundance. Care must be taken, however, not to unduly stimulate the circulation or nervous system, and any signs of this, such as headache or want of sleep indicate the curtailment of the amount drunk.