C 4fo ) 
force of Gravity towards the Center, would continue 
in a perfed ftagnation, always at the fame height, with- 
out ever Ebbing or Flowing ; but it being here demon- 
ftrated, that the Sun and Moon have a like Principle 
of Gravitation towards their Centers, and that the 
Earth is within the Activity of their AttraciJ-ions, it 
will plainly follow, that the Equality of the preffure of 
Gravity towards the Center will thereby bedifturbed ; 
and tho' the finallnefs of thefe Forces, inrefpeft of the 
Gravitation towards the Earths Center, renders them al- 
together imperceptible by any Experiments we can de- 
' vife, yet the Ocean being fluid and yielding to the leaft 
force, by its rifing (hews where it is lefs preft, and where 
itis more preft by its finking. 
Now if we fuppofe the force of the Moons attraftion 
to decreafe as the Square of the Diftance from its Center 
increafes (as in the Earth and other Celeftial Bodies} we 
lhall findjthat where the Moon is perpendicularly either 
above or below the Horizon, either in Zenith or Nadir, 
there theforce of Gravity is moftof all diminiftied, and 
confequently that there the Ocean muft neceflarily fwell 
by the coming in of the Water from thofe parts where 
the PrefTure is greateft, viz. in thofe places where the 
Moon is near the Horizon : but that this may be the 
better underftood, I thought it needful to add the fol- 
lowing Figure, where M is the Moon, E the Earth, G 
its Centre, and Z the place where the Moon is in the 
Zenith, N where in the Nadir. 
E 
Nov 
