THE FOEMS OF WATER 



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ULOUDS AND EIVERS, ICE AND GLACIEES 



§ 1. Clouds, Rains, and Rivers. 



1. Eveky occurrence in Nature is preceded by other 

 occurrences which are its causes, and succeeded by 

 others which are its effects. The human mind is not 

 satisfied with observing and studying any natural oc- 

 currence alone, but takes pleasure in connecting every 

 natural fact with what has gone before it, and with 

 what is to come after it. 



2. Thus, when we enter uponJJie study of rivers and 

 glaciers, our interest will be greatly augmented by 

 taking into account not only their actual appearances, 

 but also their causes and effects. 



3. Let us trace a river to its source. Beginning 

 where it empties itself into the sea, and following it 



