182 CONDUCTION. 



A. Because the earth is a bad con- 

 ductor of heat ; and, therefore (although 

 the ground be frozen) the frost never 

 penetrates above an inch or two below the 

 surface. 



Q. Why is the earth (BELOW the SURFACE) 

 COOLER in SUMMER than the sttrface itself? 



A. Because the earth is a bad con- 

 ductor of heat; and, therefore, (although 

 the surface be scorched with the burning 

 sun) the intense heat cannot penetrate to 

 the roots of the plants and trees. 



Q. Shew the WISDOM of GOD in making the 



EARTH a BAD CONDUCTOR. 



A. If the heat and cold could penetrate 

 the earth (as freely as the heat of a fire 

 penetrates iron), the springs would be 

 dried up in summer and frozen in winter, 

 and all vegetation would perish. 



Q. Why is WATER from a SPRING so COOL 

 in SUMMER? 



A. As the earth is a bad conductor, 

 the burning rays of the sun can penetrate 

 only a few inches below the surface ; in 

 consequence of which, the springs of 

 water are not affected. 



