EFFECTS OF EVAPORATION 9 



much of the heat but drives the blood from the surface. The 

 patient is then removed from the ice bath and placed in hot 

 blankets. The sudden change stimulates the sweat glands, and 

 perspiration starts, followed by evaporation. 



Nature has provided us with a well balanced regulator to con- 

 trol the body, a regulator known to us as the nervous system. 

 By this regulator, as the body becomes overheated, more blood 

 is brought up to the skin in order that the extra heat may pass off 

 into the outside air. When the body feels cold, this regulator 

 causes the little channels in which the blood circulates to contract, 

 so that much less warm fluid can stream through them. The blood 

 is then driven to the deeper parts of the body, where the heat 

 necessary to life can be maintained. 



This same regulator causes the pores of the skin to pour out 

 perspiration on its surface when the body becomes very hot. This 

 sweat cools the body by evaporation. 



The range of health is confined between 97Jand 99J Fahrenheit 

 of bodily temperature. A bodily temperature below 97| F. portends 

 death by evaporation or by a discontinuance of the heat-producing 

 process within the body. A temperature above 99J F. portends 

 death by an excess of heat not removed by evaporation. 



Sunstrokes, fevers, and colds are conditions due to failure of 

 the pores of the body to act normally. A person will often take 

 a hot bath and drink hot lemonade to bring out perspiration which 

 when evaporating will relieve the body of great quantities of heat. 



Why We Feel Chilly after Coming Out of a Crowded Theater. 

 When there are a great many people in a room, an excess of moisture 

 results from perspiration and respiration. The air can no longer 

 take away the moisture from the body. A person leaving such 

 a room for the drier outside air gives up the moisture which has 

 collected on the body. This takes away a great deal of heat, 

 and thus often causes a chill. 



Wearing of Clothes. The wearing of loose, porous clothing 

 allows perspiration to take place normally. People should wear 

 medium-weight underclothing throughout winter seasons. If heavy 

 underclothing is worn and the person spends most of the day 

 in an office, schoolroom, or house where the temperature is equal 



