FIRE. 49 



quickly consumed ; and the solid carbon 

 plentifully supplied with air, to make 

 it burn bright and intensely. 



Q. Why does a FIRE burn more intensely 

 in WINTEB than in SUMMER time ? 



A. Because the air is colder in 

 winter, than in summer-time. 



Q. How does the COLDNESS of the air increase 

 the HEAT of afire? 



A. For two reasons: 1st Because 

 cold air being more condensed than hot 

 air, contains a greater body : and 



2ndly Cold air rushes more quickly 

 to the fire, and supplies more oxygen. 



Q. Why does the SUN, shining on a FIRE, 

 make it DULL, and often put it out ? 



A. 1st When the sun shines, the 

 air is rarefied ; and, therefore, flows 

 more slowly to the fire. 



2ndly As the air is rarefied, even 

 that which reaches the fire, affords less 

 nourishment. 



Q. Why does the air flow to the fire more 

 TARDILY for being RAREFIED ? 



A. The greater the contrast (between 

 the external air, and that which has 



F 



