_Symptoms._—At first the patient lies in an unconscious condition, skin cold and clammy, pulse and breathing very feeble, and temperature extremely low; he can be slightly roused by shouting; he cries out if he is moved, or when painful applications are made, but quickly relapses into insensibility. The stage of unconsciousness may pass off almost at once, it may be prolonged for hours or days, or the patient may never recover from it. The second stage—that of reaction—is marked by returning consciousness and frequently by vomiting, the skin becomes warm, and gradually the patient recovers; on the other hand, inflammation of the brain may set in, or he may again become unconscious and die. _Treatment._—Keep the patient perfectly quiet in bed, in a darkened room, give a milk diet, and if he is much excited, apply cold cloths or an ice-bag to the head. If there is much prostration apply a hot-water bottle, and restore the circulation by rubbing the limbs. When reaction sets in, give five grains of calomel. Stimulants should be avoided in cases of concussion of the brain, unless the collapse is very alarming (when ammonia should be given), as they tend to cause too violent reaction, which might be followed by inflammation of the brain and its coverings. _Constipation._ This condition is very frequent in tropical climates, where it is associated with sluggishness of the liver. One of the best remedies is the two-grain tablet of cascara, of which one may be taken three times a day. Rhubarb is also a very useful drug. In addition to this, an occasional dose of a saline purge should be used, or a large enema of soap and water may be given. Five grains of blue pill or three grains of calomel will be found to act as a very efficient aperient, especially if followed in about six hours by a saline such as fruit salt. Castor oil is a valuable remedy, but it must be remembered that in the tropics its effects are sometimes rather severely felt, and hence it is well to give it in somewhat smaller doses than those usually employed in temperate climates. Three-quarters of an ounce may be given where an ounce would otherwise be employed. As a rule, the general health of people suffering from simple constipation is not seriously affected. In cases of chronic constipation one of the anti-constipation products, otherwise known as the Aloin Co., given three times a day and gradually reduced, will be found useful. In most acute diseases, such as malaria, pneumonia, etc., if constipation is present, it should be treated at once by means of suitable aperients. _Note._—In peritonitis, _i.e._, inflammation of the bowels, hernia, and in some cases of typhoid, constipation is a leading symptom, and is accompanied by severe pain in the belly. On no account should an aperient be given by the mouth in these cases. If it is necessary to clear the bowels, this should be done by means of an enema. _Coryza, or Cold in the Head._