C 4^9 3 
the othet lower Layers, unlefs it be the Layer next 
the Centre. 
Demonstration. 
While a Layer is in Circulation, it vifibly makes 
a continual Effort towards dilating itielf, by reafon 
of the centrifugal Force, with which all its Parts 
endeavour to recede from the Centre of Circafation : 
But its adual Dilatation being impeded by the Layer 
next above it, this iaft will be naturally preffed by it. 
And thus it is that the firfl: or loweft Layer, being put 
into Circulation, preffes the Second j and the Second, 
alTifted by the Firft, preffes the Third j this, affifted by 
the Two preceding, preffes the Fourths and fo on 
from Layer to Layer, through the whole Extent of 
the Vortex. Whence it follows, that in order to 
eftimate the Quantity of Force with which a Layer 
tends towards the Surface of the Vortex^ one nauft 
take the centrifugal Force proper to this Layer and 
that, which all the Matter of the Fluid contained under 
it acquires by Circulation. E. 
Corollary I. 
Therefore the dilatative Effort of the Layers in- 
creafes with the Layers in a greater Proportion than 
thefe Layers. 
QORbLLARY II. 
Therefore it is impollible to explain in thtVortex^ 
Eow Gravity decreafes in an inverted Ratio of the 
Squares of the Diftances; and confequently there 
will be nothing found in the Vortex to anfwer to 
I i i a At- 
