C ] 
again as acting laterally upon the contiguous particles 
impelling them towards the equator. But the quan- 
tity of this force, when greateft at the odtant, he 
computes to be only ^ - s \ .■ 8 of the force of gravity ; 
and therefore, fays he, it may be fafely negleCted. 
The truth is, after the lpheroid is come to be in a 
permanent date, and all its parts in £quilibrio y there 
is no longer any fuch lateral force at all ; it being 
now inti rely fatisfied by the gradual contraction of 
the earth’s axis. 
11. The general contents of the following chap- 
ters are fufficiently exprdfed in their titles already 
given. Nor can we be more particular, without 
entering into a detail of algebraical operations, which 
would be improper for this place ; and which is the 
lei's neceffary, as the fame things have been treated 
of by feveral other authors. 
This does not, however, in the leaft detradl from 
the merit of F. Frifi who difeovers throughout 
this work much acutenefs and fkill, joined with all 
the candor and ingenuity, that become a philofopher. 
And as he has not yet exceeded his 23d year, it may 
be expeded, that the fciences will one day be greatly 
indebted to him ; efpecially as we find him adually 
engaged in compofing a complete body of phyfico- 
mathematical learning. 
12. There is only, in his VI. Chapter, a criticifm 
upon one of Sir Ifaac Newton’s demondrations, in 
which we cannot agree with this ingenious author. 
And as this demondration has proved a dumbling- 
block, not only to F. Frifi, but to many other learned 
men, we fhall be obliged to conlider that part of it, 
which has been midaken, at fome length, by the 
help of the following fcheme : 
In 
