r ] 
Didances from the Centre, an Hypothefis perhaps 
might be found, that would account for mod of the 
Fhcenomena, j but that a Series of many exa& Obfer- 
vations is requifite, before we can examine with any 
Certainty the various Suppofitions that may be ima- 
gined concerning the internal Conftitution of the 
Earth. This Do&rine is likewife applied for deter- 
mining the Figure of Jupiter . 
It follows from the fame Theorem, that if we fup- 
pofe the Earth to be fluid, and abftrad from its Mo- 
tion upon its Axis, and the Inclination of the right 
Lines in which its Particles gravitate towards the 
Sun or Moon, the Figure which it would aflfume in 
confequence of the unequal Gravitation of its Par- 
ticles towards either of thofe Bodies would be accu- 
rately that of an oblong Spheroid having its Axis 
direded towards that Body. The Afcent of the 
Water, deduced from this Theorem, agrees nearly 
with that which Sir Ifaac Newton found, by com- 
puting it briefly from what he had demonftrated con- 
cerning the Figure of the Earth. Several Obferva- 
tions are fubjoined concerning the Tides, and the 
Caufes which may contribute to increafe or diminish 
them, particularly the Inequality of the Velocities 
with which Bodies revolve about the Axis of the Earth 
in different Latitudes. 
This Chapter concludes by demonftrating briefly, 
that if the Attraction of the Particles decreafed as the 
Cube of their Diftance increafes, or in any higher 
^Proportion, then any Particle would tend towards 
the lead Portion of Matter in Contact with it, with 
a greater Force than towards the greateft Body at 
any Diftance, how fmall foever from it. The true 
Law 
