36 HEAT. 



the flow of heat would be in this case into the hand, 

 from this highly heated object, and the body that 

 brought it fastest, or felt hottest, would be thereby 

 proved to be the best conductor. 



70. LIQUIDS NON-CONDUCTORS. Water 



it in a test-tube may be boiled at the top 

 'quids are non- w h jj e j ce frozen into the bottom will re- 



conditctors ? _ 



main unmelted. If a 

 bar of metal with a cavity at the 

 bottom for the ice were heated in 

 the same way, the heat would be 

 conducted downward so rapidly 

 that the ice would soon disappear. 



Explain the ?!. FlRE ON WATER. Fire may be 

 experiment kindled on water by pouring a little ether 



with ether to / 



prove that li- upon its surface and inflaming 

 the flame will be found 



heat. t have slight effect on the 



temperature of the water. And, what lit- 

 tle effect it has, is principally due to the 

 fact that the glass or metal of the containing vessel 

 carries the heat downward and distributes it to the 

 liquid. When water is heated by a fire beneath it, it 

 is not by conduction, but by another process, explained 

 in a subsequent paragraph. The above experiment 

 may be made in a tin cup very nearly filled with water. 

 A tea-spoonful of ether having been poured on the water, 

 the bottle is to be corked and set away, for fear of ex- 

 plosion, from the kindling of the ether which it con- 

 tains. The experiment, as described, is not in the 

 least degree dangerous. 



