134 EFFECTS OF HEAT. 



discharged their opposite electricities into 

 each other) vanish altogether. 



Q. Into how many CLASSES are the different 

 sorts of CLOUDS generally divided ? 



A. Into three classes : viz. Simple, 

 Intermediate, and Compound. 



Q. How are SIMPLE CLOUDS sub-divided ? 



A. 1. Cirrus. 2. Cum'ulus; and 

 3. Stra'tus. 



Q. What are CIRRUS CLOUDS ? 



A. Clouds like fibres, loose hair, or 

 thin streaks, are called cirrus clouds. 



Q,. Why are these clouds called CIRRUS ? 



A. From the Latin word, cirrus ("a 

 lock of hair, or curl") : they are the most 

 elevated of all clouds. 



Q. What do CIRRUS clouds PORTEND ? 



A. When the streamers point up- 

 wards, the clouds we falling, and rain is 

 at hand : but when the streamers point 

 downwards, expect easterly wind or 

 drought. 



Q. What are CUM'ULUS CLOUDS ? 



A. Cum'ulus clouds are lumps like 

 great sugar-loaves, volumes of smoke, 

 or mountain towering over mountain. 



