C 80 ; 
fitted to the phmomem^ and lefs incumbred with difficulties, 
than the Solution of the Weight mdSfrmg of the Air. As to the 
latter ^he diverts '-i r.That, tho wefhouldadmit aconfiderable 
gravity of a portion of Air, taken and divided as one intire fe- 
parate grofs body (as in a Bladder,a Glafs-buble, &cO fo that 
it partakes of the common quality of Heavy bodies 5 yet there 
is a peculiar preffure or gr viration belonging to this fubtile 
Fluid body,which hath irs lines of direflion every vcaj within 
the compafs of its own extream fuperficies, whereby that Per- 
pendicular gravitation^ w^hich is common to all bodies, is cor- 
rected, abated, and in a great meafure fufpended. 2 If there 
werenofuch al'ay given 10 its common Perpendicular gravi- 
tation, by its proper Mocion or its own gravitation ; yet the 
Air being one continued body, and fo interwoven and as 'twere 
iPiOrtaifed one part in another^the other parts of the Air, that 
are contiguous every where to the Earth,do fuftain and bear it 
up,like the fides of an Arch,f om all fenfibie prefigure or gravis 
tation upon any determinat or particular body, that is within 
thecompafs of its preffure. And although the Air be mingled 
with vapors of Terreftrial and Aqueous hffluvU^ heavier than 
it felf ; yet they dxe^fmth he^Co interwoven in the very webb 
and texture of the Air, that it fupports many of them; and 
thofe that are too heavy for it, or much difunlted and feparate 
from it, are precipitated upon the fuperficics of the Earth, 
and the Air difcharged of them^as in Rain,Snow,Hai!,&c. All 
which he attempts to make out by fome Experiments ; which 
whether they be unexplicable by the Hypothefis contended 
againfl: , we muft leave to thofe that are concem'd to 
Judge. 
3. He fets down, what it is not that may be fiippofed in t he 
fpace deferted by the Mercury in ihtforricellian Experimenr, 
VIZ. that *tis not Nothing^xiox Air^ nor <i^t her ^nor any body, 
that comes from without. 
4. He declares,what he thinks it is,that poffeffes the place 
derelift by the Quickfilver;^ namely,a Jukle Corporeal fubjiance 
extTActedfrom the grofs Mercurial My^ or forced out of it ; not 
by IJrns his way, which our Author takes to be this, that by 
the defcent of theMercury,and in ohfequhm mtt^r^ univerfalis^ 
or 
