152 EFFECTS OF HEAT. 



Q. Why is the AIR filled with offensive SMELLS 

 previous to a coming RAIN ? 



A. Because the volatile parts, (which 

 rise from dunghills, sewers, &c.), being 

 laden with vapour, are unable to rise so 

 readily, as when they are rarefied by a 

 bright sun. 



Q. Why do FLOWERS smell SWEETER and 



STRONGER JUSt preVWUS tO RAIN ? 



A. Because the volatile parts (which 

 constitute the perfume of flowers) are 

 laden with vapour ; and (being unable 

 to rise) are confined to the lower regions 

 of the air. 



Q. Why do HORSES and other animals stretch 

 out their necks, and SNUFF up the AIR, just previous 

 to a fall O/RAIN? 



A. Because they smell the odour of 

 plants and hay, and delight to snuff in 

 their fragrance. 



Q. Why does SMOKE FALL when RAIN is at 

 hand ? 



A. The air being less dense in wet 

 weather, cannot buoy up smoke so readily, 

 as when more dry and heavy. 



Q. Why do SWALLOWS FLY LOW ivhen RAIN 

 is at hand ? 



