Analyfts of the Air. 
occafioned by feme unheeded paffage for the 
air thro 9 the ligatures, I am uncertain 3 nei- 
ther did I care to afeertain the matter by 
repeated Experiments, fearing I might there- 
by fome way injure my lungs, by frequent- 
ly breathing in fuch grofs vapours* 
Hence Sal Tartar fliould be the beft pre- 
fervative againft noxious vapours, as being a 
very ftrong imbiber of fulphureous, acid and 
watry vapours, as is fea-falt alfo : For ha- 
ving carefully weighed the 4 Diaphragms, 
before I fix'd them in the inftrument, I 
found that they had increafed in weight 30 
grains in 5 minutes 3 and it was the fame 
in two different trials $ fo they increafed in 
weight at the rate of 19 ounces in 24 hours. 
From which deducing i part for the quan- 
tity of moifture, which I found thofe Dia- 
phragms attraded in 5 minutes in the open 
air 3 there remains 1 5 -f- 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 Diaphragms 
might attrad more than 4 part from the 
moifture of the bladders and of the fy- 
phon. 
I have found that when the Diaphragms 
had fome fmall degree of dampnefs, they 
increafed 
