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HUTTONIAN THEORY. 



43^ 



Indeed, nothing can be more juft than Dr 

 Hutton's obfervation, that where low land is 

 formed at the mouths of rivers, there the rivers 



bring d 



mo 



ay 



but 



becaufe the fe 



than the fea is able to carry 

 here fuch land is not formed, 



ble to carry off imme- 



a 



diatelj all the depofite which it receives. 



379. Mr Kirwan has denied on another princi- 

 ple the power of the fea to carry to adillance th^c 

 materials delivered into it : " Notwithilanding,'' 

 fays he, " many particles of earth are by rivers 

 Condu<6led to the fea, yet none are conveyed tp 

 any dijlance, but are either depolited at their 

 mouths, or rejeded by currents or by tides; 

 and the reafon is, becaufe the tide of flood is 



1 



always more impetuous and forcible than the 

 tide of ebb, the advancing waves being prefTed 

 forward by the ccuntlefs number behind ther^i, 

 whereas the retreating are prelTed backward by 

 a far fmaller number, as muft be evident to an, 

 attentive fpedator ; and hence it is that all float- 

 ing things cafl; into the fea, arc at 1 aft tbrown 

 on fliore, and not conveyed into the mid regions 



_ ^ 



of the fea, as they fliould be if the reciprocal 



undulations pf the tides were equally power- 

 ful*." 



380. But 



* Kirwan's Geol. Effays, p. 439 



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