Springs, Rivers-^ and the Sea. 127 



will mix with, and be absorbed by the 

 water, which being saturated therewith, 

 becomes a mineral spring or well. If 

 salt, sulphur, and lime-stone abound in 

 the strata through which the water pas- 

 ses, it will then be saline, sulphureous, 

 and lime-water. If sulphur and iron 

 should both 4 abound in the parts of the 

 hill, whence the waters come, the waters 

 will partake of the warmth or heat, 

 which is. occasioned by the mixture of 

 two such substances in the earth, where 

 they are found. 



Having noticed the different kinds of 

 springs, we shall say a few words respec- 

 ting the various phenomena which take 

 place in rivers. 



A large collection of water which runs 

 in consequence of its gravity from at 

 higher to a lower pare of the surface of 

 the earth, in a channel generally open at 

 top, is called a river. 



A river which flows uniformly, and 

 preserves the same height in the sa-ne 

 place, is said to be in a permanent state ; 

 such rivers are very rare. 



The water of a river does not flow 

 with the same velocity through the 



