STUDY IV. lS3 



from the prefTure, or the attradion of the Sun, 

 and of the Moon, on the Equator ; I (liould have 

 proved the imperfedlion of our fcientific fyftems 

 which afcribe them to thefe caufes : but I proceed 

 to repair what I have been pulling down, by other 

 obfervations ; and to demonftrate, that there is no 

 one Tide, on any coafl whatever, but what owes 

 it's origin to polar effufions. 



An obfervation of Dampier*% * will ferve, at firft, 

 as a bails to my reafonings. That careful and in- 

 genious obferver diftinguilhes between Currents 

 and Tides. He lays it down as a principle, found- 

 ed on many experiments, of which he gives the 

 hiflory, that Currents are fear cely ever felt but out at 

 Sea^ and Tides îipon the Coajis, This being laid 

 down : the polar effufions, which are the Tides of 

 the North and of the Eaft, to thofe who are in the 

 vicinity of the Poles, or of bays which have a 

 communication with it, take their general courfe 

 to the middle of the channel of the Atlantic 

 Ocean, attraded toward the Line by the diminu- 

 tion of the waters, which the Sun is there incef- 

 fantly evaporating. They produce, by their ge- 

 neral Current, two contrary Currents, or collateral 

 Whirlpools, fimilar to thofe which rivers produce 

 on their banks. 



* See Dampiei's Treatife on "Winds and Tides, 



N 4 I am 



