The temperature is of all things important to remember in infancy and childhood because fever is easily produced and runs high from slight causes. Even slight cold or the presence of constipation or slight disturbances of digestion may in babies sometimes produce a temperature of 103 F. or more. We do not speak of fever unless the elevation reaches 100 F. A temperature of 102 or 103 F. constitutes moderate fever, while that of 104 or 105 F. is high fever, and above 105 F. very high. A temperature of 107 F. is very dangerous, and is usually not recovered from. The danger from fever depends not only upon its height, but upon its duration also. An elevation of 105 F. may be easily borne for a short time, but it becomes alarming if much prolonged. THE MOUTH The tongue of newborn infants is generally whitish and continues to be so until the saliva becomes plentiful. After this we usually find it coated in disturbances of the stomach and bowels and in nearly any disorder accompanied by fever. In scarlet fever the tongue becomes bright red after a few days, and in measles and whooping cough it is often faintly bluish. In the latter affection an ulcer may sometimes be found directly under the tongue, where the thin membrane binds it to the floor of the mouth. In thrush the tongue is covered with white patches like curdled milk. A pale, flabby tongue, marked by the teeth at its edges, indicates debility or impaired digestion. In prolonged or very high fever the tongue grows dry, and in some diseases of the stomach or bowels it may look like raw beef. Grinding of the teeth is a frequent symptom in infants in whom dentition has commenced. It generally indicates an irritated nervous system. Most often this depends upon some disturbance of digestion; less often upon the presence of worms. The symptom is present during or preceding a convulsion, and may occur, too, in disease of the brain. In some babies it appears to be only a nervous habit. NURSING The manner of nursing or swallowing frequently affords important information. A baby whose nose is much obstructed or who has pneumonia can nurse but for a moment, and then has to let the nipple go in order to breathe more satisfactorily. If it gives a few sucks and then drops the nipple with a cry, we must suspect that the mouth is sore and that nursing is painful. If it swallows with a gurgling noise, often stops to cough, and does as little nursing as possible, we suspect that the throat may be sore. The ceasing to nurse at all, in the case of a very sick baby, is an evidence of great weakness or increasing stupor, and is a most unfavorable symptom. THE URINE