308 THE SEASONS CLIMATE AND HEALTH 



windows wide open, therefore, the doors and windows are left 

 open. In the severer climate of the North, during our 

 waking hours and when engaged at ordinary occupations, we 

 can not be comfortable with doors and windows open. We 

 must, then, condition the air to approximate the ideal climate. 

 During our sleeping hours, however, we can be comfortable with 

 open windows by using sufficient covers. We should, therefore, 

 learn to sleep, summer and winter, with open windows and in 

 the pure outside air. 



LIVING AND SLEEPING IN THE OPEN AIR 



337. Open-air Rooms. The open-air treatment has been 

 found very beneficial in the treatment of both tuberculosis and 



FIG. 228. Sleeping porch. (Courtesy of Dr. S. A. Knopf.) 



pneumonia. In fact, the patient suffering from either of these 

 diseases frequently lives and sleeps continually in the open air. 

 There is every reason for believing that such open-air living is 



