i6 On -THE TRANSPOSITION of AIRS. 



Having filled a tanned bladder with dephlogiUicated 

 air, and put it into a large jar of inflammable air, I ex- 

 amined them about a month afterwards and found in 

 each of. them a mixture of both the kinds of air, and in 

 the fame proportions. They both exploded alike ; and 

 with equal quantities of nitrous air occupied the fpace of 

 1.6. In the bladder there was flight appearance of fixed 

 air, but in the jar none at all. 



Reverflng this experiment, by putting a bladder filled 

 with inflammable air into a vefl'el containing dephlo- 

 gifliicated air, and letting them remain from the i2th 

 of Dec. to the 5th of Feb. I found the dephlogifticated 

 air diminiflied, and of inferior quality. The bladder 

 was air-tight, but much fhrunk. There was fixed air 

 in them both, but more within the bladder. They both 

 exploded with violence, but that in the jar feemingly 

 lefs fo than that in the bladder. With equ.il quantities 

 of nitrous air the fl;andard of that in the jar was i.i, and 

 that in the bladder 1.3. 



That the fixed air in the refult of this procefs did not 

 come from the corruption of the bladder, was evident 

 from the following experiment. On the 20th of June 

 I put a bladder full of inflammable air into ajar contain- 

 ing 90 ounce meafures of dephlogift:icated air, and on 

 the 23d of the iame month another bladder of inflam- 

 mable air into ajar of the fame air, and on the 15th of 

 July I examined them both. The 90 ounce meafures 

 of dephlogifticated air were reduced to 47, of the ftand- 

 ard of 0.6, whereas it had been of 0.16, and the blad- 

 der was found. In the other jar the bladder was almoft 

 diffolved, and exceedingly offenfive, and there was hardly 

 any appearance ot fixed air ; whereas in the jar in which 

 the bladder wasfoimd there vv^as a great quantity. 



The moft expeditious manner in which I found the 

 two kinds of air to change places was when a quantity 



of 



