Healthy living . t any ventilating with windows, always remember thatthe air should have a place to come in and a place to goout. Warm air is lighter than cold air and tends torise. So if a window is open a little at the top and a little at the bottom, or ifone window is open atthe top and another atthie bottom, the cool freshair will come in by thelower opening and thewarm stale air will passout by the upper one. In many schoolroomsand factories and in mostlecture halls and theaters,where a very great manypeople are crowded to-gether, it is necessary toprovide more fresh air than we ca
Healthy living . t any ventilating with windows, always remember thatthe air should have a place to come in and a place to goout. Warm air is lighter than cold air and tends torise. So if a window is open a little at the top and a little at the bottom, or ifone window is open atthe top and another atthie bottom, the cool freshair will come in by thelower opening and thewarm stale air will passout by the upper one. In many schoolroomsand factories and in mostlecture halls and theaters,where a very great manypeople are crowded to-gether, it is necessary toprovide more fresh air than we can get by opening win-dows. In such cases, the outside air is drawn in at thebasement by great revolving fans, is warmed a little,and is then forced up to the rooms through big pipesbuilt into the building. Outdoor Life.—No kind of ventilation can makethe air in our houses and schools quite as good as theair outdoors, where the sun shines and the wind child who wants to get the most out of life while. Fig. 55.—A good way to arrangethe window so as to ensuregood ventilation. KEEPING THE SKIN HEALTHY 139 he is a child, and to be strong and well when he growsup, should play in the open air as much as possible,except when it is very cold indeed or when it is is plenty of time for reading and sewing andother indoor occupations in wet weather and in thelate afternoon; but swimming, roller-skating, bicycling,baseball, and other games in summer, and skating,coasting, and playing in the snow in winter are betterthan books, while the sun is shining. In the sleeping room, the windows should always beopen, wide open in summer and open a few inches evenin the coldest weather, for you cannot really get themost rest out of your sleep time unless there is cool airmoving about you. Many people find it pleasant andhealthful to sleep out of doors on a sleeping porch orbalcony and, where this is possible, it is a very good planto follow. Nancys Dream.—Once upon a time
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