176 CONDUCTION. 



off into the air ; for the cold air (coming 

 into contact with our body) would grad- 

 ually draw away its heat, till it was as 

 cold as the air itself. 



Q. What then is the PRINCIPAL USE of 

 CLOTHING in winter-time ? 



A. To keep the body air-tight ; and 

 prevent the external air (or wind) from 

 coming into contact with it, to absorb its 

 heat. 



Q. Why are BEASTS COVERED with FURr 

 HAIR, or WOOL ? 



A. Because fur, hair, and wool are 

 very slow conductors of heat ; and (as 

 dumb animals cannot be clad like human 

 beings) God has given them a role of 

 hair or wool, to keep them warm. 



Q. Why are BIRDS covered with DOWN or 



FEATHERS ? 



A. Because down and feathers are 

 very bad conductors of heat; and (as 

 birds cannot be clad like human beings) 

 God has given them a robe of feathers 

 to keep them warm. 



Q. Why are WOOL, FUR, HAIR, or FEATHERS 

 tuch SLOW CONDUCTORS of heat ? 







