_How often should the nursery be aired?_ At least twice a day--in the morning after the child's bath, and again in the evening before the child is put to bed for the night. This should be done thoroughly, and the child should be removed meanwhile to another apartment. It is well to air the nursery whenever the child is out of the room. _What symptoms are seen in a child who is kept in too hot a room?_ It becomes pale, loses appetite, shows symptoms of indigestion, occasionally vomits, stops gaining in weight, perspires very much, and takes cold easily because of this and also because of the great difference between the indoor and outdoor temperatures. Its condition may be such as to lead one to suspect very serious illness. AIRING _How early may airing indoors he commenced and how long may it be continued?_ Airing in the room may be begun, even in cold weather, when the child is one month old, at first for only fifteen minutes at a time. This period may be gradually lengthened by ten or fifteen minutes each day until it is four or five hours. This airing may be continued in almost all kinds of weather. _Is there not great danger of a young baby's taking cold when aired in this manner?_ Not if the period is at first short and the baby accustomed to it gradually. Instead of rendering the child liable to take cold, it is the best means of preventing colds. _How should such an airing be given?_ The child should be dressed with bonnet and light coat as if for the street and placed in its crib or carriage which should stand a few feet from the window All the windows are then thrown wide open, but the doors closed to prevent draughts. Screens are unnecessary. _At what age may a child go out of doors?_ In summer, when one week old; in spring and fall, usually at about one month; in winter, when about three months old, on pleasant days, being kept in, the sun and out of the wind. _What are the best hours for airing out of doors?_ In summer and early autumn a child may be out almost any time between seven in the morning and sunset; in winter and early spring, a young child only between 10 or 11 A.M. and 3 P.M., although this depends somewhat upon the climate. In New York and along the Atlantic coast the early mornings are apt to be damp and the afternoons raw and cloudy. _On what kind of days should a baby not go out?_ In sharp winds, when the ground is covered with melting snow, and when it is extremely cold. A child under four months old should not usually go out if the thermometer is below freezing point; nor one under eight months old if it is below 20 deg. F. _What are the most important things to be attended to when the child is out in its carriage?_ To see that the wind never blows in its face, that its feet are properly covered and warm, and that the sun is never allowed to shine directly into its eyes when the child is either asleep or awake. _Of what advantage to the child is going out?_