^ (2CI9) 
diffident by the late ExperimentSjI caufed the pump to be pJycd, 
and the ratherj becaufe I had a mind to obferve 5 whether when 
the Air was from time to time drawn away, there would not^up- 
on the opening of the ftop-kock to let it out^ appear fome fudden 
fivell/ng, greater or lefs,of the body of the Animal^by the fpring 
and expanfion of (bme Air (or Aerial matter) included in the 
Thorax, or the Abdomen. Such an inflation ( though not great ) 
we thought we obferved 5 but till further tryal I dare not acqui* 
efce in it* A while aftersnotwithftanding our continuing to pump^ 
the Kitling gave manifeft figns of life^ which was not till it had en- 
dured divers convulfions, as great as thofe of the firft fit, if not 
greater. When 7 min. from the beginning of the exhauftion were 
compleated, we let in the Air 5 upon which the little creaturcj 
that ieemed ftark dead before, made us fufped that he might re- 
. covers but though we took him out of the Receiver, and put A» 
qua vit£ into his mouthjet he irrecoverably dyed in our hands. 
Thefetryals maydeferveto beprofecuted with further ones^ 
to be made not only with fuch Kittensjbut with other very young 
Animals of different kinds, for by what has been related it ap- 
pears^ that thofe Animals continued 3 times longer in the Exhau- 
fted Receiver, than other Animals of that bignefs would proba- 
bly have done* 
The V. Tittle. 
Some trjials about the Air ufually harboured and concealed m 
the Pores of Water ^ &c. 
IT might affift us to make the more rational conjedures about 
the Phenomena of divers of our Experiments ^ if we knew 
( fomething near ) what quantity of Aerial ftibftance is ufually 
found in the liquors^we imploy about them^efpecially in that raoft 
common of them^^F^/er.And iherefore,ihcugh it be very difficulty 
(if at all pcflible) to determine the proportion of the Air 5 that 
lurks in water, with any thing of certaintyj many circumftances 
making it fubjcdt to vary very much, yet to make the beft efti- 
mate, I eafily could, where none at all that I knew of hath been 
hitherto made by any manj I confideredj that it might afford us 
fome light, if we difcovered at leaft what proportion, as to bulk, 
the Air latitant in a quantity of water would have to the liquor it 
came from, when the Aerial particles fhould be gathered toge- 
ther into one place. Forjthough about this unionjand the Spring 
T that 
