ADVERTISEMENT. ijÇ 



" undifcovered *." The explanation of thefe phe- 

 nomena, which bid defiance to the Aftronomic 

 Syftem, are in perfeél harmony with my natural 

 Theory, which afcribes to the alternate heat of the 

 Sun, whether direâ:, or refleifled by the Moon, on 

 the ices of the two Poles, the caufe, the variety, 

 and the conftant return, of the Tides; and, efpe- 

 cially, of the general and alternate Currents of the 

 Ocean, which are the immediate moving prin- 

 ciples of thefe Tides. Our Aftronomers, not- 

 withftanding, have never attempted to give any 

 account of the half-yearly verfatility of thefe ge- 

 neral Currents, fo well known in the Indian 

 Ocean ; nay, they appear to have been hitherto 

 ignorant, that there exifted fimilar Currents in the 

 Atlantic. This is, however, a fafl which can no 

 longer be called in queftion, after the new proofs 

 which I exhibit at the end of the Fourth Volume 

 of this Work. 



I have advanced, then, no paradox, refpeâiing 

 caufes fo evident ; but I have oppofed to an aftro- 

 nomical fyftem, totally deflitute of phyfical proof, 

 fa6ts incontrovertible, deduced from all the king- 

 doms of Nature ; fads which have a multitude of 

 correfpondencies in the fiux and reflux of all rivers 

 and lakes which are fed from icy mountains, and 



* Ne'TJuton^s Philofophy, chap. xxv. 



which 



