Xliî ADVERTISEMENT. 



*' dicular rife and fall, eight feet nine inches; 

 *•' which is to be underftood of the day-tides, and 

 *' thofe which happen two or three days after the 

 *' full and new Moon. The night-tides, at this 

 *' time, rife near two feet higher. This was very 

 " confpicuous during the fpring-tide of the full 

 ** Moon, which happened foon after our arrival ; 

 *' and it was obvious, that it would be the fame in 

 *' thofe of the new Moon, though we did not re- 

 " main here long enough to fee the whole of it's 

 «^ eiFea:." (Captain Cook, April, 1778.) 



Here, then, are two tides a day, or femi-diurnal, 

 on the other fide of our Hemifphere, as in our own; 

 whereas it appears that there is only one in the 

 fouthcrn Hemifphere, that is, in the South Sea 

 only. Farther, thofe femi-diurnal tides differ from 

 ours, in this, that they take place at the fame hour, 

 and that they exhibit no fenfible rife till the fécond 

 or third day after the full Moon. We fhall pre- 

 fently unfold the reafon of thefe phenomena, which 

 are totally inexplicable on the hypothefis of the 

 Lunar Syftem. 



We fhall fee, in the two following obfervations, 

 thofe northern tides of the South Sea, remarked in 

 April, becoming, in higher Latitudes, on the fame 

 coaft, ftronger in May, and ftill ftronger in June, 

 which cannot, in any refpeft, be referred to the 

 courfe of the Moon, which paffes then into the 



fouthern 



