( 20j6) 
The XL Tide. 
\6f ihe Accidents that happened to Animals in Air brought to a confiderahle de* 
gree^ bnt not near the utmofr one^ of Rarefnovion^ 
IN i:he Generality of oDr Pneumatical Experiments upon AnimaJs it 
fuited with our purpofes,to rarifie the Air as much, and for the moft 
part as faft as we could ; but I had other Tryals in Delign, wherein an 
extraordinary degree of Rarefadion, but yet not near thehigheftto 
whichthe Air might be brought by our Engin, feem'd likeliefl: to con- 
duce to my inquiries.and particularly feem'd hopeful! to afford fome 
light in reterencc to tnofe Difeafes and Diftempers, that are thought 
primarily to afFed the Refpiratory Organs, or to depend upon forac- 
thing amifs in Refpiration. 
Wherefore having G^^^<?j-, by the help of which fuch Experiments 
might be much better performed then elfc they could, I attempted ft- 
veral of them ^ fome of whofe fucceffes I find in the following Mcraori- 
als. 
JSxperiment !• 
A Linotehcing put into a Receiver, capable to hold about 4i pints of 
water, the Glafs was well clos'd with Cement and a Cover- 
Auguli idth. but none of the Air was drawn out with, the -Engine ^or o- 
therwife» And though no new Air was kt in, rtor any 
change made in the imprifon'd Air-,yetthe Bird continu*d there 3» hours 
without any apparent approach to death : And though it feem'd fome- 
ivhat rick,yet being afterwards taken out, it recover'd and livM feveral 
hours. 
Experiment 2. 
From the abovemention'd Receiver about half the Air was drawn 
out , a Z/W<r being then in the Glafs, and in that rarify'd 
juguB i8th. Air (which appeared by a Gage to continue in that ftate ) the 
Bird livM an hour and near a quarter before it feemM in 
danger of death ^ after which the Air being let in without taking off 
the Receiver,fhe manifeftly recover'd,and leapM againft the llde of the 
Glafs ^ being taken out into the open Air (he flew out of my hand to a 
pretty diftance. 
Experiment 3 . 
Wc convey'd into a Receiver, capable to hold about 4f pints of wa- 
ter, a Z^/*)^^, together with the Gage^ by the help whereof we pump'd out 
. of the Receiver f of the Air that was in it before then 
Sepmh.fXh, heedfully obferving the Bird, we perceived it topant very 
much, fo that a Learned Phyfitian (from whom lyetdif- 
fcnted,) judgM thofe beatings to be Convi'Ifive : Having continued 
thus for a little above a minute and. a half •, the Bird fell into a true con^ 
vulQve Motion,that caft it upon the back. And although we made great 
haft to let in the Air yet before the Expiration of the Second minute, 
and confequently in lefs than half a minute from the time immediately 
preceding the Convulfion, the Lark was gone paft all recoYery,though 
diversmeans wereus'dtoefFedit. Ex- 
