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Sfr/>^of thei^/V,viz. i.What Spring is of all hands agreed to 
be truly found in the Air. 2» What Spring is fubftituted by the 
latePhilofophy,and how by the Affertors thereof it is applied 
to the Solution oifhdimmem of this kind.3.What his Reafons 
and Evidences are to evince the nuftake,as heejleems it,of this 
Elaterical fuppoficion ; and how, in his opinion, fomeArgu- 
n-ients for the Weight and Spring of the Air may be anfwer- 
ed, i r> 
6. What he thinks to^^ theCaufe that fuffends the Mercury 
from fubfidingbelow 29 inches or thereabout in the JorrkeUi- 
an Tube. Where he affirms,that the Caufc, \\hy the Mercury 
falls io low as 29! inches,is,that the weight of the defcending 
Mercurial column is of that ftrength, as to give the included 
Air that tenfion or dilatation ; and, why it fubfides no lower, 
is becaufe,when the Air hath attain'd its utmoft extenfion that 
the defcent of that column of Mercury can give it, that Aerial 
Cylinder holds it there,and keeps it up to that he ghf ,the weight 
of the Mercury being now leflTen d.Which he undertaketh both 
to' make out by fome obfervations,and to free from what may 
beobjefted againft it ^ to all which he adds inftances, by him 
conceived fit to ihew,that the Tenfion of the Air or any other 
tenfible body neceffarily efFefts attraftion on the bodies to 
whichit iscontiguous. Which done,heconfiders,how it comes 
to' pafs,chat,fince there is'yet r^^iaining about -29^ inches of 
Mercury in the Tube, which doilbtlefs hath a refidue of fubtle 
matcerextraaableout of it,tofupply a greater room than what 
is yet left above 2 9t inches, that, I fay, by the weight of that 
29-f inche^s of Mercury thereis not more of the Mercurial ef- 
fluxes extrafled and dilated, which may give a total defcent 
and an evacuation of all theMercury in theTube,into the ftag- 
nant Mercury in the fiibjacentveflel. i v.:\Hu.j 
7. He fets down and endeavours to anfwer thofe Objeftions, 
thatfeem to him of great eft force againft the fuppofition of the 
former paragraph. 
8. Heexamins particularly and laftly the cohefion of the 
Polifh't Marbles,and the Ma^dehrgk Hemifphere-, and the rai- 
fingofwatcr in common Pumps. ' 
So far of the contents oftBsJremfe ? It not being the Intent 
iM of 
