150 EFFECTS OF HEAT. 



the earth ; and this vapoury atmosphere 

 magnifies the moon, just like a magnifying 

 glass. 



Q. Wliy do CATS RUB their EARS when it is 

 likely to rain ? 



A. Either because the air is full of 

 vapour, and its humidity (piercing be- 

 tween the hair of the cat) produces an 

 itching sensation ; or more probably, 

 because the air is overcharged with 

 electricity. 



Q. How can the ELECTRICITY of air produce 

 a sensation of ITCHING? 



A. If the air is overcharged with 

 electricity, the hair of the cat is over- 

 charged also ; and this makes her feel as 

 if she were covered with cobwebs. 



Q. Why does the CAT keep RUBBING herself? 



A. Her hair will not lie smooth, but 

 has a perpetual tendency to become 

 turgid and ruffled; so the cat keeps 

 rubbing her coat and ears, to smooth the 

 hair down, and brush away the feeling of 

 cobwebs. 



Q. Why do our HEADS and SKIN itch before 

 rain P 



