If it be a case of measles, it will be necessary to adopt a different course; then the windows ought not to be opened, but the door must from time to time be left ajar. In a case of measles, if it be winter time, a _small_ fire in the room will be necessary. In inflammation of the lungs or of the chest, the windows should not be opened, but the door ought occasionally to be left unfastened, in order to change the air and to make it pure. Remember, then, that ventilation, either by open window or by open door, is in all diseases most necessary. Ventilation is one of the best friends a doctor has. In fever, do not load the bed with clothes; in the summer a sheet is sufficient, in winter a sheet and a blanket. In fever, do not be afraid of allowing the patient plenty either of cold water or of cold toast and water; Nature will tell him when he has had enough. In measles, let the chill be taken off the toast and water. In _croup_, have always ready a plentiful supply of hot water, in case a warm bath might he required. In _child-crowing_, have always in the sick-room a supply of cold water, ready at a moment's notice to dash upon the face. In fever, do not let the little patient lie on the lap; he will rest more comfortably on a horse-hair mattress in his crib or cot. If he have pain in the bowels, the lap is most agreeable to him; the warmth of the body, either of the mother or of the nurse, soothes him; besides, if he be on the lap, he can be turned on his stomach and on his bowels, which, often affords him great relief and comfort. If he be much emaciated, when he is nursed, place a pillow upon the lap and let him lie upon it. In _head affections_, darken the room with a _green_ calico blind; keep the chamber more than usually quiet; let what little talking is necessary be carried on in whispers, but the less of that the better; and in _head affections_, never allow smelling salts to be applied to the nose, as they only increase the flow of blood to the head, and consequently do harm. It is often a good sign for a child, who is seriously ill, to suddenly become cross. It is then he begins to feel his weakness and to give vent to his feelings. "Children are almost always cross when recovering from an illness, however patient they may have been during its severest moments, and the phenomenon is not by any means confined to children."--Geo. McDonald. A sick child must _not_ be stuffed with _much_ food at a time. He will take either a table-spoonful of new milk or a table-spoonful of chicken broth every half hour with greater advantage than a tea-cupful of either the one or the other every four hours, which large quantity would very probably be rejected from his stomach, and may cause the unfortunately treated child to die of starvation!