202 Analyjis of the Air. 



of fire; we fhall find in the following Expe- 

 riments many inftances of the production, 

 and alfo of the fixing or abibrbing of great 

 quantities of Air, by the fermentation arifing 

 from the mixture of variety of folids and fluid?: 

 Which method of producing and of abibrbing, 

 and fixing the elaftick particles of Air by fer- 

 mentation, feems to be more according to 

 nature's ufual way of proceeding, than the 

 other of fire. 



Experiment LXXX. . 



I put into the bolthead b (Fig. 34.) fixteen 

 cubick inches of Sheep's blood y with a little 

 water to make it ferment the better. I found 

 by the defcent of the water from z to y y that 

 in eighteen days fourteen cubick inches of Air 

 were generated. 



Exp e rim en t LXXXL 



Volatile Salt of Sal Ammoniac ', placed in an 

 open glafs cittern, under the inverted glafs 

 z z a a, (Fig. 35.) neither generated nor ab- 

 forbed Air. Neither did feveral other vola- 

 tile liquors, as fpirits of Harts-horn, fpirits of 

 Wine, nor compound Aquafortis, generate 



any 



