ADVERTISEMENT. VU 



pofition of my baptifmal names ; but it has given 

 occafion to feme miftakes. 



I do not recolleâ: my having added any thing to 

 the text, except a fmgle obfervation refpefting the 

 counter-currents of the Ohio, which I have inferted 

 in the firft volume of this third Edition. But it 

 is of confiderable importance, for it conftitutes one 

 proof more in favour of the explanation which I 

 have given of the tides. 



The Reader will pleafe to remember, that I ex- 

 plain the diredion of our tides in fummer, toward 

 the north, from the counter-currents, of the ge- 

 neral Current, of the Atlantic Ocean, which, at 

 that feafon, defcends from our Pole, the ices of 

 which are partly melted by the aftion of the Sun 

 which warms it during fix months. I fuppofed that 

 this general Current, which then runs toward the 

 South, being confined by the projedion of Cape- 

 Saint- Auguftin in America, and by the entrance of 

 the Gulf of Guinea in Africa, produced on each 

 fide counter-currents which give us our tides, re- 

 afcending to the north along our coafts. Thefe 

 counter-currents aduallyexift in thefe fame places, 

 and are always produced on the two fides of a ftrait 

 through which a current forces itfelf. But I had 

 no need to fuppofe the re-actions of Cape Saint- 

 Auguftin and of the entrance of the Gulf of Guinea, 



a 4. in 



