220 PHYSIOLOGY AND HEALTH. 



CHAPTER X. 



Those who have poor or insufficient Food, or Dyspepsia, or breathe 

 bad Air, need more Clothing. More Clothing needed in dry and 

 windy Weather than in damp and still Air. More needed in 

 travelling than when quiet. Every one should be clothed com- 

 fortably. Hardening. Old People and Children must be well 

 clothed. 



528. THE quantity of clothing depends, not only upon 

 habit, but upon many other circumstances which are con- 

 nected with the health, and which affect the generation of 

 internal heat, and the healthy actions of the skin. If one is 

 not supplied with sufficient fuel for the internal fire ; if he is 

 ill-fed, and has insufficient or poor food; if he is dyspeptic, 

 and his stomach is unable to convert his food into the chyle 

 for the blood ; if nutrition goes on heavily, and the changes 

 of particles are slow ; or if he exercises but little, and the 

 energies of his life are dormant, he can bear less expo- 

 sure unprotected, and he therefore needs more clothing. 



529. Or if the lungs are supplied with insufficient air; if 

 one sits in a crowded and unventilated lecture or school room 

 for hours ; if he ascends to the top of a mountain, where the 

 rarefied atmosphere contains a smaller quantity of oxygen ; 

 or if the chest is encased with tight dress, so that it cannot 

 expand and receive sufficient air ; or if the lungs are diseased 

 and'their air-vessels partially closed; if in any way the blood 

 receives less than its due amount of oxygen, then there is 

 less heat to be given out, and more protection is required. 



530. If the fuel of good and nutritious food is not sup- 

 plied for the internal fire, there must be greater external 

 fire, or more protection ; for then the body cannot sustain the 

 loss of so much heat as would pass from flesh at 98 to a 

 surrounding atmosphere at the ordinary temperature (65 to 

 70) of comfortable rooms. Insufficiency of food thus cre- 

 ates a necessity for a greater expenditure for clothing and 

 warming. 



