CLOUDS. 133 



A. Because red rays are the least 

 refrangible of all, and not being bent 

 back by the air (like blue and green), 

 strike upon the horizon, and give a tinge 

 to the morning clouds. 



Q. Wliy is not the reflection of clouds always 



ALIKE ? 



A. Because their size, density, and 

 situation in regard to the sun, vary per- 

 petually ; so that sometimes one colour is 

 reflected, and sometimes another. 



Q. What regulates the MOTION of the CLOUDS ? 



A. The motion of the clouds is 

 generally directed by the winds; but 

 sometimes electricity will influence their 

 motion also. 



Q. How do you know that CLOUDS move by 

 OTHER influences besides WIND ? 



A. Because we often see in calm 

 weather small clouds meeting each other 

 from opposite directions. 



Q. How do you know that ELECTRICITY 

 affects the motion of the clouds ? 



A. Because clouds often meet from 

 opposite directions ; and (after they have 



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