(aon) 
DivCj to forbear for a pretty while refpiring under water with- 
out prejudice , I thought it worth the tryal , whether fuch Birds 
would much better than other Animals endure the abfence of the 
Air in our exhaufted Receiver. The Accounts of which tryais 
were, when they were made, regiftred as follows. 
Experiment the i. 
We put 2i iuW gmmn Dnck^ ( being not then able to procure a 
fitter) info a Receiver, whereof fhe fill'd , byourguefs, a third 
part or fomewhat more ) but was not able to ftand in any e^fy 
pofture in it 5^ then pumping out the Air, though (he feemed at 
firft (which yet I am not too confident of , upon a fingle tryal , ) 
to continue well fomewhat longer than a Hen in her condition 
would have done s yet within the ftiort fpace of one minute (he 
appeared much difcompoled , and between that and the fecond 
minute, her ftrugliog and convuliive motions increafed fo much, 
ihat^ her head alio hanging careklly down, (he feemed to be juft 
at the point of death 3 from which we prefently refcued her by 
letting in the Air upon her : So that, this Duck being reduced in 
our Receiver to a gafping condition within lefi than two minutes, 
k did not appear, that, notwithftanding the peculiar contrivance 
of nature to enable thefe water- Birds to continue without refpi- 
ration for fome time under water , this Duck was able to hold 
outconfiderably longer than a Hen , or other Bird not- Aquatick, 
might have done : and to manifeft, that it was not clofenefs and 
Barrowne(s of the veflel, in reference to (b bulky an Anima],that 
produced in the fubjeft of our tryal the great and fuddain change 
above- recited, we foon after included the fame Bird in the (ame 
Receiver, and having by a fpecial way cemented it on very clofe, 
we (liffered her to ftay thus fliut up with the Air for five times as 
long as formerly (by ourguefle , helped by a watch, ) without 
perceiving her to be diipompofed 5 and fhe would probably have 
continued longer in the fame condition, if my patience and lei- 
fure would have held out fo longj as £be could bave^done in that 
prifbn^ 
Experiment the 2. 
Having at the feafon of the year procured a D^r^ft^^jthat was 
yet CalloWjWe conveyed her into theftme Receiver wherein the 
former had been included, and obferved, that, though for a while 
fhe appeared not much diiquieted, whilfl the Air was pumping 
out of the glafi^ yet before ih^ firft minute was quite ended , fhe 
gave 
