VENTILATION, HEAT, AND CLOTHING 103 



4. The skin gives off heat by contact with the cool air 



and by its perspiration. 



5. Heat is always given off at such a rate as to keep the 



temperature of the body at 98^ degrees Fahrenheit. 



6. When the body is too warm we have a fever and are 



sick. 



7. The ordinary feelings of cold and warmth are due to 



the state of the nerves in the skin. 



8. Burning or freezing a part kills the cells. Thaw a 



frozen part very slowly. 



9. We should keep a room warmed to about 70 degrees 



Fahrenheit. 



10. Clothing retains the heat of the body, but does not 



make new heat. ^ 



11. The oxidation of alcohol develops heat in the body, 



but it causes more to be given off through the skin 

 than was produced. 



