( 2037 ) 
Prefently after we put into the fame Receiver a (7r^<f^/wi?, and having 
withdrawn the Air till it appeared by the Gage there remaiaM but half, 
we prefently began to obferve the Bird;and took notice, that, wichin a 
minute after,flie appear*d to be very lick^ and (baking her 
head, threw againft the infideofthe Giafs a certain fub- Septmh.pxK 
ftance which I took to be Vomit, and which afterwards ap- 
peared fo i upon this Evacuation the Bird feemM to recover, and coa- 
tinue pretty well (but not without panting) till about the end of the 
fourth Minute, at which growing very Tick, Ihe Vomited again (fliaking 
her hesid as at firftj'ibut much more unqueftionably then before, and foon 
after, eat up again a little of her Vomit at which time (whether that 
contributed to her Recovery or no) Ihe very much recovered. And 
tho (he had, in all, three fits of Vomiting • yet for the laft feven or cighe 
minutesthat we kept her in the Receiver, fiie feem'd to be much more 
lively then was expedcd t which may in part be attributed to a little Air 
that by an accident got in, tho it were immediately pumpM out agaifie 
At the end of a full quarter of an hour from the firft Exhaufdon of the 
- Receiver, the Bird appearing not likely to dye in a great while, and the 
Engine being needed for other Ufes, we took out the Bird and thereby 
^ put a period to th^ Experiment* 
Experiment J» 
I now thought it fit to try ,Whether, though a Viper would not hold 
out very many hours in Air brought to as high a Rarefadion, as we 
could bring it by our Engin, yet to that cold and vivacious Animal, a 
very fmall proportion of Air, in comparifon of what was neceffary to 
hot Animals, would not fuffice to keep it alive for a confildcrable time i 
TheNarration of the Experiment I find regiilrcd as follows. 
A Viper lately bought of the perfon, that at this feafon u- 
fes to take new ones,almoil from day to day, was included Jprilizt)x, 
together with a Gage in a portable Receiver,capabJe to hold 
about 3i pints of water, Thisveflel being exhauiled,and fecured againft 
the regrefs of the Air,the imprifoned Animal was obferved from time to 
time ^ and obferved not only to be alive, but nimbly to put out and to 
draw back its tongue about 3 6 hours after it was firft ihut up-, for whicfr 
reafon we continued the Veffel longer in the fame fhady place ^ where 
at the end of 60 hours looking upon her, as I was going to bed, flic ap- 
peared very dull and faint, and not likely to live much longer : And the 
next morning being by fome occafions carried abroad, and coming to ■ 
look upon the Glafs prefently alter dinner, I found her ftark dead 
with her mouth openM to a ftrange widenefs wherefo**e fuffering wa- 
ter to be impelled by the outward Air into the cavity of the Receiver, to 
obferve how far that veflei was then emptied of Air, we found by the wa- 
ter that was driven inland afterwards poured out again and meafured, 
that 4 parts of 5., or ratlier 5 ot 6 of the vefielM Airrii'I may fo call that- 
which was fhut up in the Receiver^ Had been pumpM out : 5o that in an 
X z Air 
