There are usually just two reasons for diarrhea--uncleanliness and bad milk. During the hot summer days flies multiply greatly and all manner of bacteria and germs grow in warm, moist, shadowy places, so that usually before the milk leaves the dairy farm it is seriously contaminated with disease-producing germs. If the milk is not kept at a temperature of 35 or 40 F. (which is just above the freezing point), these bacteria, particularly the manure germ, grow at such a rate that by the time the milk gets to the infant it is teeming with bacteria, and diarrhea is the sure result. Another form of diarrhea is cholera infantum, where the stools soon become watery and colorless. The vomiting is almost incessant and there is high fever. Fortunately it is a rare disease, but when once seen it is never forgotten. One beautiful baby weighing nearly thirty pounds was reduced to sixteen within forty-eight hours, and when death came he could hardly be recognized because of the wasting from this most dreaded of infant diseases. Another form of diarrhea is seen in an acute inflammatory condition of the intestine itself. The stools contain more or less mucus and blood. The bowel movements, which are very frequent, are accompanied by a great deal of pain and straining. This form is often seen in the more severe types of summer dysentery. We wish to impress upon the reader's mind that these diarrheas may all be avoided if the baby's food is clean and free from germs, if the apple or pear is not only washed, but thoroughly scrubbed before paring during the summer months. If all the bottles, nipples, water, toys, etc., are adequately clean, no summer diarrhea, no dysentery, no other infection due to dirt, will attack the baby. Of paramount importance is the pasteurization of milk during the summer months, as mentioned elsewhere. TREATMENT OF DIARRHEA Simple diarrhea in the older child of two or three years is treated as follows: Take away all solid foods. Give a big dose of castor oil, thoroughly wash out the bowel by warm water containing a level teaspoon of salt and a level teaspoon of baking soda to the pint, and put the child to bed in a quiet room. Boil all milk for ten minutes and thicken it with flour that has been browned in the oven; feed this to the child at five-hour intervals. After each bowel movement, no matter how often they come, the colon should be washed out with the salt and soda enema as before mentioned. Bear in mind that the child is losing liquids, and so, after the bowels have moved, boiled water should be given by mouth, or a cupful of water can often be retained if it is introduced into the rectum slowly under very low pressure. Twenty-four or forty hours should clear up a case of simple diarrhea, and on returning to food it should be dry toast and boiled milk. For the younger baby, withhold all milk and give barley water or rice water for the first twenty-four hours, returning to milk very gradually and slowly.