BAROMETER. 329 



Q. What are the WETTEST months ? 



A. October and February ; then 

 July and September; then January and 

 December. 



Q. Why is there LESS wet from MARCH to 

 AUGUST, than there is from August to March ? 



A. Because the heat is constantly 

 increasing ; and the capacity of the air 

 to absorb and retain moisture increases 

 likewise. 



Q. Why is there MORE wet from AUGUST to 

 MARCH, than there is from March to August ? 



A. Because the heat is constantly 

 decreasing, and the capacity of the air to 

 retain moisture decreases also ; so that 

 (although it often rains) yet the air is 

 always on the point of saturation. 



Q. Why does the mercury of a barometer 

 RISE in a FROST ? 



A. Because frost condenses the air ; 

 and condensed air is heavier than rarefied 

 air. 



Q. Why does the mercury of a barometer FALL 

 in a THAW ? 



A. Because the air is both warmer 

 (or more rarefied), and also filled with 

 vapour. Fa3 



