[4] 
continual Impulfe tending upwards, and afting upon all 
its parts equally i And befides the obfcurity wherewith he 
expreffcs himfelf particularly, <Srf^.2j. does fufficiently argue 
according to his own Rules, the confuled Idea he had of the 
thing he wrote. 
Others, and among them Dr. FJ?^^/^ afferts the Caufe of 
- tjie Defcem of heavy Bodies to be the Diurml rotation of the 
Eanth upan its Axis^ without confidering^ that according to 
the Dodrine of Motion fortified with Demonftration, all 
Bodies moved in Circulo, would recede from the Center of 
$h(?ii: Motion ; whereby the contrary to Gravity would fol- 
low, and all loofe Bodies would be caft into the Air in a 
TangeM to t\\Q Parallel oi Latitude^, without the intervention 
of fbme other Principle to keep them faft, fuch as is that of 
Gravity, Befides the effeft of this Principle is throughout 
the whole Surface of the Glob found nearly equal, and cer- 
tain Exferiment 'ktms to argue it rather Ms near the Eqm- 
;^^?^7/W, than towards the Pt?/^'/, which could not b^by any 
means, if the Diurml rotation of the Earth upon its Axis 
were the caufe of Gravity^ for where the Mgtion was fwift- 
oft, the Effeft would be moftconfiderabfe,, yroiUi . v i^ r 
Others affign the Prefft^re of the Atmffhtre ^ to W the 
Caufe of this Tendency towards the Gent^r of the Earth \ but 
unhappily they Imve miftaken the. Cmfe: .'^t^^^jf^di' ^ it 
being from undoubted Principles plain, that th^Atmfj^here 
has no other Prejfure but what it derives from its Gra^ity^^nd 
that the Weight of the upper parts of the AiK^ prefling on 
the lower parts thereof, do fo far bend the. Springs, of that 
ElaJlick Body^ as to give it a force equal to the Wci^t that 
ComprefTed it, having of it felf no force at all : And fiippo- 
fing it had, it will be very hard to explain the Mod^^ how 
that Prejfure fhould occafion the Defcent of a Bc?^ circum- 
fcribed by it, and prefTed equally above and below, without 
Ibme other force to draw, or thruft it downwards. But to 
demonftrate the contrary of this Opinion, an Exprimmt was 
long fince fhewn before the Koyal Society , whereby it ap- 
. peared 
