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abfolutely neceflary to make Fire, of which the Air being ex- 
hauftedby Defiagration^theFire niuil: needs beextinguifli\^;and 
afTuming thereupon^rhat ih^EUJlietty of the Air proceeds from 
- fuch Aerial particles as maintain Flame; having found, as he 
-p/^^,by Experiments,that Air deprived of thofe Nitro-aeriai 
parts loofeth its Springy vertue 5 which venue he a!fo affirms 
to be leffened by the Refpiration of Animals,who, in his opini- 
on,do exhauft out of the Air certain Vital, and thofe Elaftique, 
particles^infomuch that he doubts not but that fomethiDgAeri- 
al,abfolutely neceffary to life,pa(reth into theBlocd of Animals 
by means of their Refpirationj whofc necefiity therefore he can* 
not acknowledge toarifefrom thence only, that thereby and by 
the Motion of the Lungs the maf^^ of Bloud may be communica- 
ted, as fome have afTerted : Concluding at laft, that f/>^ and 
Life are inaintain'd by the fame Aei iai parts; and giving a rea- 
fon, why an Jmmalis able to live in a Receiver a while after a 
Cmdle is extinguifli*t ; which is,that,i;^ his opimon^ there is re- 
quired a greater quantity of Aerial particles to the burning of 
a C^W/^,than the maintaining of Lj/>. Whence yet he would by 
no means have it infer'd,that^ though Flame and Life are main- 
tain'd by the fame particles, therefore the Mafs of blood is kin- 
^/^^i, as fome teach ; Which doftrine how folidly our Author 
difputes againftjwe leave to thofe that are concerned to examin. 
Mean time,finding great difficulties in this matter of Sprin' 
ginefs^hc con(iders,by what ways the Elaflique vertue of things 
may arife ; where he concludes,that, though it may partly pro- 
ceed from the agitation of the Aerial parts by a fubtilc matter 
interfperfed amongft them ; yet it feems to him, that the Spring 
of the Air doth chiefly proceed from,and confift in, this, that 
the rigid parts of the Air, being compreft by the w^eight of the 
incumbent Atmofphere,and thereby inflefted,do endeavour to 
expand themfelves. 
Next,he attempts to explain. How the Air comes to loofe its 
Spring \n Flame ; affirming, that forafmuch as the Rigidity of 
<the Ramous parts of the Air proceeds from theA'^Vr^?-/^^r/Wcor- 
pufc1es therein infixed, and the Spring from that Rigidity, 
therefore the former parts of the Air being deprived of the 
; l4ter,they not only become unfit to maintain the ' Fire, but al fo 
