ADVERTISEMENT. XXlX 



and ftraits, running at the rate of from eight to ten 

 leagues an hour, hurrying along with them an in- 

 finite multitude of floating icy promontories, and 

 of tumultuous tides, which, as well as the Currents, 

 precipitated themfelves diredly from the North, 

 from the North- eaft, or from the North- weft, ac- 

 cording as the land lay. In conformity to thofc 

 invariable and multiplied fafts, I myfelf have de- 

 rived complete convidion, that the fufion of the 

 polar ices was the fécond caufe of the movement of 

 the Seas ; that the Sun was the primary caufe -, and 

 on this 1 founded my theory of the tides. See, 

 Vol. I. Explanation of the Plates, Atlantic Hcmi- 

 fphere. 



VII. The Currents of the South-Sea, in like 

 manner, have their fource in the ices of the South 

 Pole. Hear what Cook fays on the fubjeft, in his 

 Journal, January 1774. *' Indeed the majority of 

 " us were of opinion, that this ice extended to the 

 *' Pole ; or that it might poffibly join fome land, 

 *' to which it has adhered, from the earlieft times : 

 ** that to the South of this parallel, are formed all 

 '/ the ices which we found here and there to the 

 . ** North ; that they are afterwards detached by vio- 

 ^ lent gufts of wind, or by other caufes, and thrown 

 ** to the North by the Currents, which in high 

 " Latitudes, we always obferved to bear in that 

 " direaion.'* 



This 



