C 4?o ] 
Attradion, whofe Exiftence Sir Ifaac Newton has fo 
demonftratively eftablifhed. 
Corollary III. 
Thus we have re- eftablifhed in its full Light the 
Difficulty, which Monfieur de Fontenelle propofed to 
Monfieur Villemot in the Memoirs of the Academy 
for the Year 1705 This learned Academician pre- 
tends, that as in the Vortex the lower Points ought to 
move fafter than the upper, in order to prefervc 
Keplers Aftronomical Law j they ought alfo to have 
a greater centrifugal Force, and confequently compel 
them to defcend, particularly in proportion to their 
Fluidity. The Objedtion made a great Noife, and 
the only Method found of getting rid of it, was by 
faying, that although each lower Point had more 
centrifugal Force than each upper ; yet as the Vortex 
was in <iyEquilibriumj and the Sums of the Force of 
each of the Two Layers were equal, there was no 
Reafon why the lower Stratum fhould get the better 
of the upper? becaufe this was as prevalent by the 
Number of its Points, as that was by the Force of 
each of its own. 
But it is manifeft, after what has been demonftratcd 
above, that the fecond Layer, being affifted by the 
firft, muft have a greater Force than the third, and 
confequently compel it to defcend, purfuant to the 
Principle then granted to Monfieur Fontenelle, 
But if it be asked. How could the upper Layer 
defcend, feeing Matter is impenetrable ? 
* He afterwards publiflicd a Book, intituled, Nouveau Syjletne, ou nouvelle Explication 
du MouveiKtnt des PlaneKt, ^ar M, Philippe Villemot, Pretre, beiieitr en Hbcologie, &c. 
2^on, 1707. in 12®, 
