THE KEASON v, FIT. 47 



* The fining pot is for silver, and the furnace for gold : but tho Lord trieth the 

 hearts." PEOVEEBS xvn. 



121. Which feels the warmer, the conductor or non-con- 

 ductor ? 



The non-conductor, as it does not readily absorb the warmth of 

 our bodies. 



122. What substances are the best conductors of heat? 



Gold, silver, copper, and most substances of close and hard for- 

 mation, &c. 



123. What substances are the worst conductors of heat T 

 Fur, eider down, feathers, raw silk, wood, lamp-black, cotton, 



soot, charcoal, &c. 



124. Why has the toasting-forlc a wooden handle ? 



Because wood is not so good a conductor as metal, therefore the 

 wood prevents the heat from being transmitted by conduction to 

 our, hands. 



125. Why 7ias the coffee-pot a wooden handle ? 



Because the metal of the coffee-pot would otherwise conduct the 

 heat to the Jiand ; but wood, being a bad conductor, prevents it. 



126. Why does hot water in a metal jug feel hotter than 

 in an earthenware one ? 



Because metal, being a good conductor, readily delivers heat to 

 the hand ; but earthenware, being an indifferent conductor, parts 

 with the heat slowly. 



127. Hoio can we ascertain that icood prevents the conduc- 

 tion of heat to the hand? 



By passing the top of the finger along the wooden handle of the 

 coffee-pot, until it reaches the point where the wood meets the 

 metal. The wooden handle will be found to be cool, but the metul 

 will feel very hot. 



128. Of what use are kettle-holders? 



Being made of bad conductors, such as wood, paper, or 

 woollen cloth, they will not readily conduct the heat from the kettl* 

 to the hand. 



