HYGIENE OF RESPIRATION 



175 



keep the alimentary canal pure throughout by reasonable 



eating and living. We also meet with those who believe 



not only that the clothes, the skin, the lungs, the digestive 



organs, must be kept clean, but 



that the blood must be clean and 



fresh, ever renewed by a strong 



and vigorous flow, and they so 



live that as far as possible it 



shall always be so. The daintily 



dressed lady or the dandified man 



would be horrified at a particle 



Of mud that fell Upon the Clothes, Fia I50 ._ Ventilation by an Ordi- 

 but Sometimes if yOU are SO Un- nary Grate or Fireplace. 



fortunate as to catch a whiff of The coldest air chills the feet - 



the breath of such a person, its repulsive, sickening odor 

 shows that foulness and uncleanliness 

 have taken possession of the lungs, or 

 digestion, or blood. We should be 

 careful to observe these five degrees 

 of cleanliness, but which should we 

 value most highly ? There is still 

 another degree in cleanliness, or pur- 

 ity, which concerns purity of mind 

 and nobility of soul. 



298. The Mistake of the Overstu- 

 dious. The pale student, thinking 

 only of the desire for learning aroused 

 by teacher or parents, and neglecting 

 the promptings of his natural instincts 

 toward complete living, thinks he is 

 doing wisely and right when he is 

 constantly delving into books. On 

 the contrary, he is sinning against 



part of his nature and unfitting himself for accomplishing 



the best work he is capable of doing. 



FIG. 151. 



The air enters through a special 

 inlet and is warmed as it 

 passes through a hood sur- 

 rounding the stove. 



