THE REASON WHY. 53 



"He giveth snow like wool: ho scattereth the hoar frost like ashes." 

 PSALM CXLTII. 



proving the truthfulness of the Bible simile, which says, God 

 " giveth snow like wool." 



CSYSTAiS OB SSOYT, A3 SEEJf TUBOUGH A MICBOSCOPB. FlCK 1. 



163. Why does it frequently feel warmer after a frost hat 

 *et in ? 



Because, in the act of congelation a great deal of heat is given, 

 out, and taken up by the air, and thus the severity of the cold 

 is in some degree moderated. 



164. Why is it frequently colder when a thaw takes place ? 

 Because, in the process of thawing, a certain amount of heat is 



icithdrawnfrom the air, and enters the thawed-ice. 



165. What benefit results from these provisions of Nature ? 

 They moderate both the severity of frosts, and the rapidity 



of thaws, which, in changeable climates, would be seriously 

 detrimental to life, and to vegetation. 



166. WJiy are furs and woollens worn in the winter ? 

 Because, being non-conductors, they prevent the warmth of the 



body from being taken up by the cold air. 



167. Why are the skins of animals usually covered with 

 fur, hair, wool, or feathers? 



