As strong solutions of permanganate of potash attack the plunger of the piston, when this drug has been injected, the syringe should be well washed with water directly after its use. _Hypodermic tablets._—Solutions for injection are best made from tablets which are specially prepared for the purpose. A hypodermic tablet should be dissolved in about ten drops of hot water, but as each contains a definite amount of the drug, it does not matter in exactly how much water the dose is dissolved. In injecting certain preparations of quinine, which are not easily soluble, so much water may be required that two or three separate injections are necessary; there is no objection to this, the important thing is to have the quinine really dissolved. Usually only medical men should administer hypodermic injections. Frequently it is not necessary to give a hypodermic injection, for the hypodermic tablet will be absorbed, and act almost as quickly if placed under the tongue. The traveller may be called upon to use one of the following hypodermic injections:— Permanganate of potassium. _See_ Snake-bite, p. 281. Morphia. An injection of a quarter of a grain of morphia may be necessary when there is much pain. The soothing action of opium and chlorodyne is due to this substance. Strychnine. _See_ Snake-bite, p. 282. _Baths, etc._ _Cool Bath._—Lift the patient gently in a blanket into a long bath containing water at about 90° F., add water as cold as can be obtained, keep the water circulating and running out; one boy must pour water on to the head all the time. If a long bath is not at hand, put a blanket over a waterproof sheet, and let the patient lie on it; get six or eight boys to hold up the edges, and give patient his bath in that way. A good plan is to dig a shallow trench in the sand and to spread a waterproof in it; it is less difficult then to keep the edges of waterproof up as the patient is lying in a groove. It is not necessary to make the bath really cold if the cool water can be kept running. I have hardly ever been able, in Africa, to get the water below 80° F. Note the bowel temperature, and as soon as it falls to 101° F., remove the patient from the bath and put him between warm blankets, and feed with some hot soup. If there are any signs of faintness, ammonia, or equal parts of strong spirit and water, must be given. Weak spirit and water has little or no stimulating effect on the heart, therefore, in cases of fainting, shock, exhaustion, or collapse from any cause, give a little spirit, and give it strong.