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Sect. V,] 



GEOGRAPHY 



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course, and instead of flowing id to the sea in a continued 

 line, are compelled to run for some distance parallel to 

 the coast, imtil the accumulated backwater has acquired 

 sufficient power to overcome the diminished resistance 

 of the sea-beach : this, however, more properly belongs 

 to the consideration of the coast line. 



But the description of a river will be imperfect, unless 

 we also state the number and character of the streams 



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which fall into it. And here we have to consider the 

 angle at wliich the rivers join each other, whether the 

 direction of the main stream is altered or not by the 

 junction, the relative size of two confluent streams, and 

 which of them may be said to preserve its former course 

 with the smallest deviation. On the true description of 

 these details must depend the question as to which of two 

 confluent rivers should be considered as the main or parent 

 stream. Rivers are said to be confluent when both 

 branches are nearly equally deflected from their former 

 direction, and that of the united streams may be said to be 

 the resultant of two contrary forces. An affluent is a stream 

 which falls into another called the recipient without chang- 

 ing the direction of the latter, and entirely losing its own. 



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a and b are conlluent streams, d is an affluent failing into c, the recipient. 





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