AnaJyJis of the Air. 2^7 



fioned by fome unheeded paiLge for the air 

 thro' the ligatures, I am uncertain ; neither 

 did I care to afcertain the matter by repeated 

 Experiments, fearing I might thereby fome 

 way injure my lungs, by frequently breathing 

 in fuch grofs vapours. 



Hence Sal Tartar mould 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 having 

 carefully weighed the four Diaphragms be- 

 fore I fixed them in the inftrument, I found 

 that they had increased in weight 30 grains 

 in five minutes ; and it was the fame in two 

 different trials ; Co they increafed in weight 

 at the rate of j 9 ounces in 24 hours. From 

 which deducting £ part of the quantity of 

 moifture, which 1 found thofe Diaphragms 

 attracted in 5 minutes in the open air ; there 

 remain 15 -j- -| 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 at- 

 tract more than £ part from the moifture of 

 the bladders and of the fyphon. See Exper. 6. 

 Vol. II. Appen. p. 323. 



I have found, that when the Diaphragms 

 had fome fmall degree of dampnefs, they 



increafed 



