164 ^nalyfts of the Air. 
phureous grofs vapours, or whether it was 
occafioned by fome unheeded paffagefor the 
air thro’ the ligatures, I am uncertain j nei- 
ther did I care to afeertain the matter by re- 
peated Experiments, fearing I might thereby 
fome way injure my lungs, by frequently 
breathing in fuch grofs vapours. 
Hence Sal Tartar (hould be the befl: pre- 
fervative againft noxious vapours, as being a 
very ftrong imbiber of fulphureous, acid and 
watry vapours, as is Tea fait alfo : For ha- 
ving carefully weighed the 4 T>iaphragmSy 
before I fixt them in theinftrumenr, I found 
that they had increafed in weight 30 grains 
in five minutes 5 and it was the fame in two 
different tryalsj fo they increafed in weight 
at the rate of 19 ounces in 24 hours. From 
which deducing i part for the quantity of 
moifture, which I found thofe T)iaphragms 
attraded in 5 minutes in the open air 5 there 
remains 15 f ounces, for the weight of 
the moifture from the breath in 24 hours : 
But this is probably too great an allowance, 
confidering that the T>iphragms might at- 
ttad more than J part from the moifture of 
the bladders and of the fyphon. 
I have 
