Analyjis of the Air. 1 7 1 



for two or three minutes : As foon as the flame 

 was out, I marked the height of the water 

 z z ; after which the water would for twenty 

 or thirty hours continue rifing a great deal 

 above z z. 



Sometimes, when I would pour violently 

 fermenting liquors, as aquafortis, &c. on any 

 materials, I fufpended the aquafortis in a phial 

 at the top of the glafs veffel z z a a, in fuch 

 manner, that by means of a firing, which 

 came down into the veffel x x y I could by 

 inverting the phial pour the aquafortis on 

 the materials, which were in a veffel on the 

 pedeftai. 



I mall now proceed to give an account of 

 the event of a great many Experiments, which 

 I made by means of thefe inftruments, which 

 I have here at firft defcribed, to avoid the fre- 

 quent repetition of a defcription of 'em. 



It is confonant to the right method of phi- 

 lofophifing, firft, to analyie the fubjecl, 

 whofe nature and properties we intend to 

 make any refearches into, by a regular and 

 numerous feries of Experiments : And then, 

 by laying the event of thofe Experiments be- 

 fore us in one view, thereby to fee what 

 J.ight their united and concurring evidence 



will 



