Symptoms.--The onset is sudden and pronounced. The child begins to vomit and continues vomiting and retching persistently. The bowels are loose, and large, watery, greenish stools are frequent. The prostration is very marked, the child looks seriously sick, respiration is quick and shallow, the eyes sunken, the skin becomes ashen gray in color, and the pulse is soft and very rapid. The fever may be very high or it may remain low. The low febrile cases are the worst. If taken in hand quickly and if the treatment is energetic and if the child reacts, the case may go rapidly on to recovery and the child be wholly well in a few days; or it may not react, but be overwhelmed by the poison and sink and die in twenty-four hours. Treatment.--In the treatment of cholera infantum it must not be forgotten that the dangerous element is the poisoning of the system that is constantly going on. It is difficult for the non-medical mind to estimate the importance of this element. It is, of course, caused by the bacteria present in the gastro-intestinal canal. There are numberless millions of bacteria in the normal healthy bowel. A very large percentage of those germs are good for us, are there for a beneficent purpose, and can and do protect us from other germs which occasionally find their way into the bowel and whose purpose is not a peaceful one. When the bowel condition changes, as during an attack of summer diarrhea, it is invaded by multitudes of evil-intentioned germs. These germs find conditions in the diseased bowel exceedingly favorable to them, so they begin work in an active, energetic way. The result of their activity is highly poisonous, and, as the good germs are virtually out of business and are consequently not working in our interest, we are absolutely in the hands of the enemy. There is soon manufactured, by these invading germs, enough poison to poison the entire system of the child. It is this feature that we must combat in summer diarrhea. It is absolutely essential to keep these cases as much in the open fresh air as possible. No matter how sick they may be, this rule must be observed. Light clothing is advisable. If it is a city child that is affected and it does not show decided improvement in three or four days, it should, if possible, be sent to the country. There is always distinct danger of a relapse in every case, so the little victim should be given a change of air as soon as convalescence permits. The seashore is preferable to the mountains in all intestinal cases. In the care of these patients cleanliness is an important factor and counts much in the ultimate cure. The child, as well as the clothing, should be kept scrupulously clean. Napkins as soon as soiled should be removed and put into a disinfecting solution. The buttocks should be well powdered after each movement to prevent sores developing.