[ i86 ] 



^ an ofglafs tube, and one meafure of ni- 



airsdef- trous air joined to it, the mark Hood 



troyed. a f ter ma king and repofing at 1.92 ; 



a fecond meafure being added, it 



Hood at 1.79 ; after a third meafure 



a 1.6 8 j ; after a fourth meafure at 



1.87I; after a fifth meafure at 



415 2.85. 



By trying it in the other way 

 familiar to Dr. Priefde)\ the refult 

 was as follows : one meafure of it, 

 with two meafures of nitrous air, 

 occupied 0.88, 



By pufhing this manner of trial 

 farther, as I do, the refult was this : 

 by adding to the two former mea- 

 fures of nitrous air a third one, 

 the mark was 1.83 ; by adding a 

 nig fourth, it marked 2.81. Thus it 

 appears that by this lafe method 

 the quantity of both airs deftroyed 



amounts 



