HAIL. 335 



Q. Why is ONE bed of air COLDER than 

 another ? 



A. This is frequently caused by elec- 

 tricity in the air, unequally distributed. 

 Q. Why is HAIL frequently accompanied with 



THUNDER and LIGHTNING ? 



A. 1st Because the congelation of 

 water into hail disturbs the electricity of 

 the air : and 



2ndly The friction (produced by the 

 fall of hail) excites it still more. 



Q. Why does HAiL/a^ generally in SUMMER 

 and AUTUMN ? 



A. 1st Because the air is more 

 highly electrified in summer and autumn : 

 and 



2ndly The vapours (being rarefied) 

 ascend to the more elevated regions, 

 where the cold is greater than it is nearer 

 the earth. 



Q. What TWO things are essential to cause 

 HA.IL? 



A. Two strata of clouds having 

 opposite electricities, and two currents of 

 wind. The lower cloud (being negative) 

 is the one precipitated. 



