(2027) 
rhc Air is withdrawn by the Engin, yet at the end of two full minute?; 
letting in the Air, and then taking off the Receiver we found the 
Bird irrecoverable ; notwithftanding which we did not find any no- 
table alteration in the Lungs, and found the Heart (or at leaft the Au- 
ricles of it) to be yet beating, and fo it continued for a while af- 
ter. 
Experiment the 2, 
We took alfo a pretty large Frog , and having without violating the 
Lungs or the Guts made two fuch incifions in the Abdo- 
men, that the two curled bladders or lobes of the Lungs Tfje famt daf, 
came out altnoft totally at them , we fufpended the Frog 
by the legs in a fmall Receiver , and after we had pumped out a good 
part of the Air, the Animal ftru^led very much, and feemed to be much 
jifordered, and when the Receiver was well exhaufted , ihe lay ftilf 
for a while as if fhe had been dead, the Abdomen and thigh very much 
fwelled, as if fome rarified Air or Vapor forcibly diflended them. But 
"as, when the Frog was put in, one of the Lobes was alraoft full , and 
the other almoft flirunk up, fo they continued to appear, after the Re- 
ceiver had been exha«II:ed- but upon letting in of the Air , not only 
the body ceafed to be tumid, but the plump bladder appeared for a whiic 
fhrunk up as the other, and the Receiver being removed, the Frog 
prefentJy revived , and quickly be^an to fill the Lobe again with 
Air* 
The IX, Title. 
Of the faction of the Jeparated Heart of a Cold Antmal in the 
Exhaufied Receiver. 
Wlthoutdifcufling the opinions of Learned men about the con- 
nexion and dependency of the Motion of the Bloud, and Beat- 
ing of the Hear:, I thought, it might give me a fufficient inducement 
to make the following Experiment, that feveral forts of Animals would 
be prefently killed in our Vacuum by the withdrawing of the Air , and 
even the Inleds mentioned in the formerly publifiied Bigrejp on dhoxxt 
Refpiration, though they alfo were not totally deprived of life by the 
-abfence of the Air, yet they were of vijible motion: Wherefore fome 
good hint or other being to be hoped for from the difcovering , whe- 
ther or no a feparated Heart, which is but a part of an Animal, would 
continue its motions in our Vacuum we made fome tryals to that pur- 
pofe, whofe fuccefs I find thus fet down* 
Experiment the i. 
The Heart of an Esle being taken out and laid upon a plate of Tin 
in a fmall Receiver, when we perceived it to beat there as it had done ir* 
U the 
