XXXVl ADVERTISEMENT. 



her attraflion more liable to fafpicion. But we 

 ftiall fee prelently, that in the vaft Ocean itfelf, the 

 greateft part of the tides have no manner of rela- 

 tion either to her attraction or to her courfe. 



I have already quoted, in the explanation of the 

 plates, the Navigator JDampier, who informs us, 

 that the highefl: tide which he obferved, on the 

 coafts of New Holland, did not take place till three 

 days after the full Moon. He affirms, as well as 

 all the Navigators of the South, that the tides rife 

 very little, between the Tropics, and that they are, 

 at mofl, from four to five feet high, in the Eaft 

 Indies, and a foot and a half only, on the coafts of 

 the South Sea. 



Let me now be permitted to afk. Why thofe 

 tides, between the Tropics, are fo feeble, and fo 

 much retarded, under the direâ; influence of the 

 Moon ? Wherefore the Moon, by her attradlion, 

 gives us two tides every twenty-four hours, in our 

 Atlantic Ocean, while (he produces but one in 

 many places of the South Sea, which is incompara- 

 bly broader ? Wherefore there are, in that fame 

 South Sea, diurnal and femidiurnal tides, that is of 

 twelve hours and of fix hours ? Wherefore the 

 greateft part of the tides take place there conftant- 

 ]y at the fame hours, and rife to a regular height 

 almofl all the year round, whatever may be the ir- 

 regularities 



