420 CAPILLARY ATTRACTION. 



often pour the water into the SAUCER, and not OVER 

 the PLANTS ? 



A. Because the water in the saucer 

 is supped up by the mould (through the 

 hole at the bottom of the flower-pot), 

 and is transferred to the stem and leaves 

 of the plant by CAPILLARY ATTRACTION, 

 fSeep.84). 



Q. Why is vegetation on the MARGIN of a 

 RIVER, more LUXURIANT than in an open FIELD? 



A. Because the porous earth on the 

 bank sups up water to the roots of the 

 plants by CAPILLARY ATTRACTION. 



Q. Why is a LUMP of SUGAR (left at the 

 bottom of a cup) so LONG in MELTING ? 



A. Because as it melts, it makes the 

 tea above it heavier ; and (so long as it 

 remains at the bottom) is surrounded by 

 tea fully saturated with sugar ; in con- 

 sequence of which, the same portions of 

 liquid will hold no more sugar in solution. 



Q. Why does the LUMP of SUGAR MELT more 

 QUICKLY when STIRRED ABOUT ? 



A. Because fresh portions of unsatu- 

 rated tea keep coming in contact with the 

 lump, and soon dissolve it. 



