r 4'7 ] 
of our Adverfaiies, God could not form a lingle 
Vortex. 
I defire Attention may be given, that a circular 
Motion is a redoubled and forced Motion j and not, 
as Mr. Ter atilt thought, a natural Motion. Now the 
redilincar Motion cannot be redoubled thus, as againft 
its Nature, in order to become circular, but upon a 
Suppofition that it meets in the ambient Matter in- 
vincible Obftacles to its Diredion ; or that by a pri- 
mitive Law it is carried towards a Centre by a Mo- 
tion of Gravitation, at the fame time that it receives 
a Motion in a drait Line. Therefore, fince on one 
hand this univerfal and primordial Gravity is obfti- 
nately rejeded ; and on the other, as it is folidly 
proved above, that the ambient Matter is no Obftacle 
to the redilinear Motion ; it remains certain, that the 
Formation of the Vortex is impoflible. ^ E. T). 
Second and Third Part. 
The Vortex, though once formed^ cannot laftt and 
it is not fufficient for explaining the celeftial 
Phsenomcna. 
PoSTULATUM. 
The cylindric Vortex cannot long fubfift, and is 
not fufficient for explaining the celeftial Thanomena : 
This Principle is allowed by all Cartejians in both 
its Parts. It cannot fubfift; becaufe not having Force 
to defend itfelf towards the Poles, if it happened to 
hit on that Side againft another cylindric Vortex, that 
prefented its Equator, it would foon be broke into, 
and 
