338 



RESPIRATION AND EXCRETION 



Ventilation of Sleeping Rooms. Sleeping in close rooms is 

 the cause of much illness. Beds ought to be placed so that a 

 constant supply of fresh air is given without a direct draft. This 

 may often be managed with the use of screens. Bedroom windows 

 should be thrown open in the morning to allow free entrance of the 

 sun and air, bedclothes should be washed frequently, and sheets 



Unfavorable sleeping conditions. Explain why unfavorable. 



and pillow covers often changed. Bedroom furniture should be 

 simple, and but little drapery allowed in the room. 



Hygienic Habits of Breathing. Every one ought to accustom 

 himself upon going into the open air to inspire slowly and deeply 

 to the full capacity of the lungs. A slow expiration should follow. 

 Take care to force the air out. Breathe through the nose, thus 

 warming the air you inspire before it enters the lungs and chills 

 the blood. Repeat this exercise* several times every day. You 

 will thus prevent certain of the air sacs which are not often used 

 from becoming hardened and permanently closed. 



