(1040) 
To furmcuntthcfe difficulties, the firft ttiihgl thought on was, %o 
take t fine limber ind clear Bladder of a (hcep or bogg, made more 
tranfparentby being anointed with Oyl, which was done on the out- 
fide, that the fmeli of it. might lefs offend the Animal tobe included. 
Then we clipped off as much of the Bladder at the neck, aswas fudg'd 
abfoiutely neceflary to make an Orifice capable of letting in a Meufe 
thatfort of Animals heing, by rcafon of their fmallnefs, the fitted of 
thofe furnifliM with Lungs and hot blood, we conld procure. And 
whereas it leemed very difficult, when the neck of the bladder was cut 
ofF,to make up fo large an orifice without wrincklcs, at which the rari- 
fied Air may efcape- to obviate this inconvenience we provided a round 
flick fomewhat lefs then the Orifice •, that, the wood being iaii over 
with a clofe and yielding cement, (for, pitch Or the like common ftuff 
will not alwaics lerve the turn ) we might be able to tye the bladder faft 
and clofe enough upon the thus fitted ftopple. 
And now to reduce thefe things to pradice, and by their help make 
our defigned Experiment, we included a Moufe into a Receiver made 
according to this way , leaving in the bladder as much Air,as we thought 
might fuffice him for as long a time as the Experiment was to laft. Then 
putting this limber or extenfible Receiver, if I may To call it, into an or* 
dinary one of Glafs, and placing this Engine near a window, that we 
may fee through both of them the Air was by degrees pumped out of 
the external Receiver, (as for diflindion fake I (hall call it,) and there- 
upon the Air included in the bladder did proportionably expand it felf 
and fo diftend the external Receiver, till being arrived at a degree of 
Rarefadion, which rcndred it unfit for the included Moufes Refpira- 
tion,T perceived, though with fome difficulty,' in this Animal thefigns 
of his being in great danger of fudden death. "Whereupon the outward 
Air,being haftily let into the external Receiver, comprefTed the fwelled 
bladder to its former dimenfions, and thereby the included Air to it« 
former dcnfityjby which means the fainting A/o^fe was quickly revived. 
Having given him fome convenient time of! refpite, the Experiment 
was reiterated with the like fuccefs, and we doubted not but the third 
tryal, we made, would have ended as the two former did ^ but that, 
whileft we were confidering of the ficknefs of the Moufe, which, by rea- 
fon of fome opacity that could fcarce be avoided in the wrinckled blad- 
der,was not, as to its degree, fo eafily taken notice of, it grew irrecove- 
rable by the fubfequent condenfation of the Air, 
N,B. The Confirmiitionof this by further Experiments will proper- 
ly fall under another Title. 
The XIII. Title. 
Of an mf^ccefsfull Jttemftto fr event the necejfity of Ref^lrmon hy the Pro- 
dud ion or growth 'of Animals in avrr Vacuim. 
Having had frequent occafions to obferve, how quickly thofe Ani- 
malswhofe l-lood is a*dwally warm, did expire in our Vacmm • and that 
even thofe x^nimals vv^ith Lungs ^ whofe Blood was actually cold, were 
