On the transposition of AIRS. 19 



Fourteen and an half ounce meafures of inflammable 

 air having been expofed in this manner a good part of a 

 day, was reduced to 8|- ounce meafures, nearly in the 

 fame ftate with common air, without any thing inflam- 

 mable in it. But ID ounce meafures of inflammable air 

 from fpirit of wine was firft increafed to lo^, of the 

 ftandard of 1.56, then to 12^, of 1.37; and it was fl:ill 

 flightly inflammable. 



Seven ounce meafures of dephlogifticated air was in- 

 creafed to 12, of the flandard of 1.9, and it was after- 

 wards brought to 1.25 with an equal meafure of nitrous 

 air ; fo that it was in all refpefts atmofpherical air. 



Ten ounce meafures of phlogifticated air came out 1 1 , 

 of the fl:andard of 1.8. It was afterwards farther increaf- 

 ed, and was finally of the ftandard of 1.38. 



In all the preceding cafes the change was produced 

 by means of the fine pores in the earthen veflel, but 1 

 found that in more time the fame change would be made 

 through a quantity of water in a glafs retort. For four 

 meafures of inflammable air having been expofed to heat 

 in this manner, though it was not changed in its dimen- 

 fions, was become of the ftandard of 1.5, and exploded 

 like a mixture of inflammable and common air. 



Inflammable air kept in glafs jars ftanding in water 

 does not in general undergo any fenfible change in many 

 months, except that it prefently faturates itfelf with 

 water, and thereby becomes heavier than when frelli 

 made. But, to my great furprife, 1 found that, though 

 a glafs vefTel was perfedly air-tight, yet if it had been 

 broken, and the pieces had been joined with paint, or 

 cement, the air would in time be changed for the ex- 

 ternal air. At firlt I found that ajar of this kind of air 

 had in it a confiderable quantity of common air by the 

 manner in which it exploded, and by its being diminifti- 

 ed by a mixture of nitrous air. But afterwards 1 found 



C 3 the 



