354 ICE. 



ductor, that our frosts never continue 

 long enough to convert a whole river into 

 a solid mass of ice. 



Q,. Why does not RUNNING water freeze so 

 fast as STILL water? 



A. 1st Because the motion of the 

 current dissolves the crystals as fast as 

 as they are formed ; and 



2ndly The heat of the under surface 

 is more freely distributed to the upper 

 surface by the rolling water. 



Q. When RUNNING water is FROZEN, why is 

 the ICE generally very ROUGH ? 



A. Because little flakes of ice are 

 first formed and carried down the stream, 

 till they met some obstacle to stop them ; 

 other flakes of ice (impinging against them) 

 are arrested in like manner; and the 

 edges of the different flakes overlapping 

 each other, make the surface rough. 



Q. Why do SOME parts of a RIVER FREEZE 

 LESS than OTHERS? 



A. Because springs issue from the 

 bottom, and (as they bubble upwards) 

 thaw the ice, or make it thin. 



Q. \l lien persons FALL into a RIVER in winter 

 time, why does the WATER feel remarkably WARM? 



