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out (hewing any fign of life, being quite ihff and 
dead. 
Two other lively mice were fuccedively treated 
in the fame manner. The appearances in thefe were 
exadly the fame as in the firft. Both of them, after 
they had been in the mephitic air a few moments, 
fell down motionlefs, and were taken out dead. And 
tho’ the laft of the three was taken out of the receiver 
as foon as pofiible after it ceafed to move, yet it never 
after fliewed the leafl fign of life. The fame ex- 
periment was, fome days after, tried in air frdh 
extraded from the Pouhon water, on two of the 
finall birds mentioned in the foregoing experiment ; 
in wdaich air they, in like manner, alfo foon expired. 
By way of Scholia to the lafi: experiments, I beg 
leave to refer to what I have written concerning the 
mineral elaftic fpirit of the acidulae, in my fourth 
Ellay on Damps, and other Mineral Exhalations, 
which is in the poflefiion of the Royal Society. 
I fliall not now detain the Society any longer with 
more of my experiments ; but, if thefe fliould be 
thought worthy of its notice, fiiall, hereafter, com- 
municate other methods of extricating the air from 
the Pouhon water, as well by heat, as by other me- 
diums 5 and, from proper obfervations and experi- 
ments, fhall endeavour to explain the modus of the 
union of this fubtile elaftic fluid and the other prin- 
ciples with which it Is combined in thefe waters, to- 
gether with the relation that it bears to common air, 
and to feveral other bodies. Which obfervations and 
experiments may, perhaps, be thought worthy the 
attention of thofe who hereafter may make enquiries 
2 concerning 
