=Complications and Sequels.=--These are many and make whooping cough a critical disease for very young children. Bronchitis and pneumonia often complicate whooping cough in winter, and diarrhea frequently occurs with it in summer. Convulsions not infrequently follow the coughing fits in infants, and, owing to the amount of blood forced to the head during the attacks, nosebleed and dark spots on the forehead and surface of the eyes appear from breaking of small blood vessels in these places. Severe vomiting and diarrhea occasionally aggravate the case, and pleurisy and consumption may occur. The violent coughing may permanently damage the heart. Rupture of the lung tissue happens from the same cause, and paralysis sometimes follows breaking of a blood vessel in the brain. But in the vast majority of cases in children over two years old no dangerous sequel need be feared. =Outlook.=--Owing to the numerous complications, whooping cough must be looked upon as a very serious disease, especially in infants under two years, and in weak, delicate children. It causes one-fourth of all deaths among children, the death rate varying from three to fifteen per cent in different times and under different circumstances. For this reason a physician's services should always be secured when possible. =Treatment.=--A host of remedies is used for whooping cough, but no single one is always the best. It is often necessary to try different medicines till we find one which excels. Fresh air is of greatest importance. Patients should be strictly isolated in rooms by themselves, and it is wise to send away children who have not been exposed. Morally, parents are criminally negligent who allow their children with whooping cough to associate with healthy children. If the coughing fits are severe or there is fever, children should be kept in bed. Usually there is not much fever; perhaps an elevation of a degree or two at first, and at times during the disease. Otherwise, children may be outdoors in warm weather, and in winter on warm, quiet days. Sea air is especially good for them. It is best that the sick should have two rooms, going from one to the other, so that the windows in the room last occupied may be opened and well ventilated. Fresh air at night is especially needful, and the patient should sleep in a room which has been freshly aired. The temperature should be kept at an even 70 deg. F., and the child should not be exposed to draughts. Vaporizing antiseptics in the sick room has proved beneficial. A two per cent solution of carbolic acid in water is useful for this purpose, or a substance called vapo-cresoline, with which is sold a vaporizing lamp and directions for use. A one per cent solution of resorcin, or of hydrogen dioxide, diluted with four parts of water, used in an atomizer for spraying the throat, every two hours, has given good results. In the beginning of the disease, before the whooping has begun, a mixture of paregoric and syrup of ipecac will