Avalyfis of the AW. 191 



of tartar, which was 15 days old, and com- 

 mon air, by filling two equal tubes with 

 thefe different airs, the tubes were 10 inches 

 long, and fealed at one end ; I placed them 

 at the fame time in a cylindrical glafs con- 

 denfing receiver, where I compreffed them 

 with two additional atmofpheres, taking 

 care to fecure myfelf from danger in cafe 

 the glafs mould burft, by placing it in a 

 deep wooden veffel ; the water rofe to equal 

 heights in both tubes. This receiver was 

 gently annealed, and thereby toughened, by 

 being boiled in Urine, where it lay till all 

 was cold. 



I put alfo into the fame tubes fome new- 

 made air of tartar, both the tubes /landing 

 in cifterns of water ; the air of one of thefe 

 tubes I compreffed in the condenfing en- 

 gine for fome days, to try whether in that, 

 compreffed ftate, more of the air's elafticity 

 would be deftroyed by the abforbing vapours, 

 than in an uncompreffed ftate ; but I did 

 not perceive any fenfible difference. 



Lemery\ in his courfe of chymiftry, p. 592. 

 obtained, in the diftillation of 48 ounces of 

 Tartar, 4 ounces of phlegm, 8 of fpirits, 

 3 of oil, and 32 of fcoria, i. e. two thirds 

 ct the whole $ fo one ounce was loft in the 

 operation. I n 



