64 



HYDROGRAPHY. 



[Sect III. 



S 



and low water there hy the shore will govern the turn of 

 the stream either along the whole channel or until it 

 reaches a spot where another meeting of the streams 

 occurs. In such a channel also it will prohably be found 

 (as in the Irish Channel) that the same strelm make, 

 high water at one end and low water at the other at the 

 some time ; so that the observer must entirely divest his 

 mind of the too often mistaken notion of the turn of the 

 stream being governed by the rise and fall of the water 

 in its immediate locality. As our space does not admit 

 of further detail, I shall leave the subject in the hands of 

 the observer with a remark which, whilst it will put him 



f observations are required, 



m possession of what kind 



will at the same time I think insure his interest in the 

 subject and his hearty desire to co-operate in the matter. 

 In the « Philosophical Transactions, 1848,' Part I., it 

 has been shown that in such a channel as that above- 

 mentioned there have been discovered two remarkable 



spots 



u 



velocity witliout there being any material rise or fall of 

 the water by tlie shore, and in the other that the water 

 rises and fails considerably without tjiere being any appa- 



rent motion of the stream. 



Such phenomena are highly 

 curious, and worthy of all the attention that can be 

 bestowed upon the observations. In tracing them it is 



mam test th"^ 



cHj 



they 



are intimately connected with the 

 height and progress of the tide wave along the shores of 

 iha channel, but this properly belongs to another section 

 (see Tides). 



9. Passing the mouths of 



Amazon, th 



great 



such as the 



, tiie river Plata. Orinoco, Mississippi, Zaire, 







> 



\ 



1 



^ct. Ill-: 



Sene; 



■al 







a 



The 



fiuence 



0\ 



liim^elf 



oft 



>iiV.- 



might e, 

 of this 

 courses 



it, and 



angle 



IV. 



accordin 

 Tliel 



been gl , 



of the J 



1 ' 



\ 



have \k , 

 of the ' 



hmits, 1 



place*, . 



havin 



. * The I 



^■- 300 te ; . 



^' hour, 

 nearly f^ 



/ 



