348 WATER. 



current) such substances as it cannot 

 dissolve. 



Q. Why does ETTNNING water OSCILLATE 

 and WHIEL in its current ? 



A. 1st Because it impinges against 

 its banks, and is perpetually diverted from 

 its forward motion : and 



2ndly Because the centre of a river 

 flows faster than its sides. 



Q. Why do the SIDES of a river flow more 

 TAEDILY than its CENTEE ? 



A. Because they rub against the 

 banks, and are delayed in their current 

 thereby. 



Q. Why does SOAPY water BUBBLE? 



A. Because the soap makes the water 

 tenacious, and prevents the bubbles from 

 bursting as soon as they are formed. 



Q. Why will not water bubble WITHOUT SOAP ? 



A. Because it is not tenacious enough 

 to hold together the bubbles that are 

 formed. 



Q. When SOAP BUBBLES are blown from a 

 pipe, why do they ASCEND ? 



A. Because they are filled with warm 

 breath, which is lighter than air. 



