Diphtheria.--The most striking symptom of diphtheria is the growth of a substance in the upper part of the windpipe, which threatens to close it entirely. Good medical skill is of first importance here, yet much may be done where that is not available. We have often seen the swallowing of a little hot water and treacle enable the children to throw up the entire obstruction and make the breathing perfectly free. Mark at once whether the feet are cold or warm. If cold, oil them well with olive oil, and pack in a hot blanket fomentation to the knees. When the feet and knees are thoroughly warm in this, put a cold cloth on the back of the neck down between the shoulders. Change this as often as felt comfortable. The throat may be brushed out with a weak solution of Condy's Fluid, but a strong solution of common salt will do very well. Good white vinegar and water (_see_ Acetic Acid) is perhaps best of all. We have never seen this fail in changing the character of such growths, and if the windpipe can be washed out repeatedly with it, we should feel sure of a desirable result. Now, we have seen a humble working man's wife wash out the throat of her son as well as any medical man could do it, using Condy's Fluid for the purpose with full success. When you can, have the help of a medical man, but when you are so placed that such help is impossible, you need not fear to try yourself. If there is much fever, cold cloths may be applied to the head to reduce the heat. As the disease is strongly infectious, care should be taken to isolate the patient, and attendants should avoid his breath. Abundance of fresh air and light should be allowed to enter the room, and one window at least should be open as far as possible. Douche, Cold.--In its most powerful form this is a _solid_ stream of water directed down on the patient's shoulders and spine. It may be applied either by an apparatus fixed up for the purpose, or by merely pouring from a watering-can _without_ a rose. Its power depends on the great heating in the skin which springs up when it is withdrawn. This heating power again depends on the strong shock given to the system when it is applied. Thus it will be seen that what is called a "Spray" or "Spray Douche" is of little use for the same purpose, as it gives little or no primary shock. It is with this application as with many. The patient's feeling benefit is the great and true evidence of the treatment being right. When the douche issues in bodily comfort and cheering to the mind, all is right. If it issues in discomfort, then some other treatment must be tried.