AIR BY WATER. 25 



The laft ftate of all thefe kinds of air was phlogifli- 

 cated, that of inflammable air as well as the refl ; and 

 feme idea of its gradual approach to this ftate may be 

 formed from the following obiervations. 



Five ounce meafures of inflammable air were reduced 

 from Aug. 19th to Sept. 5th to i^, barely inflammable. 

 In the fame time 2 ounce meafures were reduced to 0.35, 

 wholly phlogifl;icated ; and from the fame date to Nov. 

 9th, 3 ounce meafures were reduced to ■- an ounce mea- 

 fure, wholly phlogifticated. 



Having formerly found air much changed by agitation 

 in water, I now repeated thefe experiments with this 

 view, and obfervcd that the abforption went on rapidly 

 to a certain point, but that the agitation impeded the to- 

 tal abforption, and when the water was warm the quan- 

 tity was in fome cafes increafed. But unlel's the jar in 

 which 1 agitated the air flood in an open trough, a large 

 furface of which was expofed to the atmofphere, the 

 eft'edl was inconfiderable. 



After agitating one meafure of common air ten minutes 

 it was reduced to 0.36. After five minutes more it was 

 0.12, but after another five minutes it was 0.16; and 

 though the air was much phlogifticated, it was never 

 wholly fo, being never worfe than of the ftandard of 

 1.85, when two meafures were reduced to one. 



When one half of any quantity of inflammable air 

 was abforbed in this procefs, it was wholly phlogifticat- 

 ed, though the air given out by the water in which it 

 was agitated was of the ftandard of common air. 



After agitating 2 meafures of inflammable air, in wa- 

 ter which contained air of the ftandard of 1.6, till it 

 was reduced to lefs than one meafure, I found it wholly 

 phlogifticated. The agitation was continued an hour. 

 Meaiuring after every five minutes, I obferved the quan- 



VoL. V. D tity 



