( 2045) 
Ihe XIV. Title; 
Of the power of AjfuefaBim to enable Animals to hold out mAir:>l'j RarefaCtim 
on made unfit for Ref firation^ 
The p6wer <?/Afluefadion in other Cafes^made me thinks it verjvfell worth trj' 
ingwhat tt rfould do in Refpirationi AkA the rather^hecatofe Iprefunedjt might 
prove an Experiment of good ufe^ifwe fljould difcover^ihat by h gr^tdual acet^om 
mance an Animal maj be brought to live ^either in a much thinner Air^ or much 
longer in the fame Air^ than at Jirfi he couid, But in regard that to make fnch a 
Tryal perfpicuouflj enough^the opamj of the Bladder made ufe of in the former 
TitIc,T?'^J like to be an Impediment^ I devifed another way to obviate that Incon* 
venience^ which may J hope ^ be competently under flood ^bj theheedfullpernfal of 
the following Trjals, 
Experiment i. 
We included in a round Violl with a wide ncck^Cthe whole Glafs being ca* 
pable of containing about 8 ounces of Water) a young and fmali M?///f, and 
then tycd ftrongly upon the upper part of the Glaffcs neck a fine thin bladder^ 
out of which ihe Air had been carefully exprefled, and then con^^eycd this 
Phantaftical Vcflel into a middle fized Receiver, in which we alfo placed s 
Mercurial Gage ( ad jufted by our elfewhere mentioned flandard^ ) This done^ 
the Air wa» by degrees pumped out,iill it appeared by the Gsge, that there 
retnained bue a fourih part in the external Receiver (as for dillindions fake I 
cali it i ) whereupon ihe Air in tht internal Receiver cxpsnding it fclf, 
^appeared to have blown the Bladder almoft half full,and the Mouf^ fecming vc- 
Ty ill at cafe by his Lcaping,and othcrwlfe endeavouring to pafs out at the neck 
of his iineafy Prifofij we did, for fear the over thin Air would difpatch 
him 3 let^ the Air flow into the externaliReceiver, whereby the bladder beir g 
coroprefTcd, and ihe Air in the Violi reduced to its former dcniityj the little 
Animal qciickly recovered* 
Experiment 2« 
A while afcer^without removing the biadd€r,the Eiperimcnt was repeated, 
«nd the Air by the help of the Qsge was reduced to its former degree of Ra- 
rcfadion,and the Moufe , after fome fruiilefs endeavours to get out of the 
GlafSjWas kept in that thin Air for full 4 minutes ; at the end of which he ap- 
peared fo fitk,that>to prevent his dying immediately, we removed the Exte'-. 
nal,and took out the Internal Receiver^ Whereupon^ though he recovered, 
yet 'twas not without much difficuhy, being unable to (land any longer upon 
his fecc,and for a great while after continued manifeftly trembling. 
Experiment 3, 
But having fufTered him to reft a reafonable fpace of time, prefoming that 
ialfuefad on hadaccuftomcd him to greater hardftiips, weconveycd h m again 
into the external Receivcr^and having brought the Air to the former d gree 
of ExpanHon^we were able tokeephira there for a full quarter of an hour ; 
though the external Receiver did not at all confiderably leak - as appeared 
both by the Mercurial Gage^and by the continuing diftenlion of the Bladder^ 
And 'ti'i worth notirgjThatjtill near the latter end of the quarter of an hour^ 
notonly the Ammaidid fcarce at all appear d)ftreflcd, remaining Hill very 
Y 2 quiets 
