( 542 ) 
Some Experiments touching Animals, made in the Air- 
pump the Perfons formerly mentionedyiz.Mo^" 
g Compun Numb. 62 fieur Hugens And M. Papin ||. 
and 63 of theft ^ -n 1 
Tra^if whtn many Experimtntt of thkkjnd, made by Mr, Boyle, anrtC9tdtd, 
ONe day I included m the vacuum SLti Infect which reremblcs 
di Beetle, but is a little bigger; and when I perceived it 
to appear dead, I gave it Air again, and itfoon after recovered. 
Then I put it in the 'i/^^//^;^ again, and having left it there, for an 
hour, I readmitted the Air, and found, that the Infcfl needed then 
much more time to recover* I included it there the third time, 
and having left it there two daies, I gave it Air again, andfaw, 
it needed above ten hours before it began to ftir again ^ yet it re- 
covered well enough this time : But having put it in again the 
fourth time, and left it there eight daies, it would never ftir 
again. 
Intending to try the like upon a I faw, that when I 
readmitted Air to it, that thetop of its back , which before was 
much fwelled, did fall-in more than it fiiould, and the Infeft would 
not recover, 
I a'fo killed \nt\\twcmm many Animals that breath, as Eirds^ 
^ueyRdtSyEabbets, Cats; and fome of them I recovered by 
quickly giving them Air again, before the Engine was quite ex- 
haufted; but I never faw any of them revive, that had been in a 
perfeft vacuum. 
Monfieur Guide did make frequent Diffcflions of fuch Animals 
as we had thus killed , and obferved among other things, that 
their Lungs fell to the bottom in water. In a little Book of his, 
printed of ihisSubjeft, he hath decJared his opinion concerning 
this Experimefit. He being a Jover of truth, I am perfwaded, 
he will not rakeitannfs,if I deliver my fentiment about it,wbich 
I think more probable than his. 
He faith, that the Solidity or Clofenefs of the Lungs of Ani- 
i^ials that have died in vacuo^ comes from hence , that the Blood, 
which is propelled into the Lungs by the Vena arteriofa , doth fo 
ftrongly prefs the bronchi the Jrteria afpera ^ that it exprefles 
the Air out of them, and glues as 'twere their fides to one ano- 
ther. But for m.y part, I do not believe, that the Blood of the 
vena 
