^ [ 239 ] 



after edulcoration, deficcation and ignition, weighed 70,25 grains 

 nearly ; but at the rate above-mentioned thefe 70,25 grains are re- 

 ducible, deducing the fixed air to 55,10 of pure barytic earth. 



On the other hand 108 grains of cryftallized foda contain 23,22 

 grains of mere foda, and thefe we have already feen are capable of 

 taking up 31,41 of real nitrous acid, therefore by this experiment 

 100 grains of cryftallized nitrated barytes contain 31,41 of acid 

 and 55,10 of earth ; the remainder then is water of cryftallization, 

 = 1 3>49 grains. 



Again, 100 grains of cryftallized nitrated barytes were diflblved 

 in 2400 of water, and precipitated by the gradual addition of a 

 Iblution of vitriolated tartarin ; the precipitate which was flowly 

 and difficultly formed and coUedted weighed after ignition about 

 88 grains; thefe (at the rate of 33,33 per cent.) contained 29,33 

 of real vitriolic acid, and confequently 58,67 of mere earth. 



Taking a mean, then, of thefe two experiments, 100 grains of 

 nitrated barytes contain 56,88 grains of mere earth. 



Lastly, 308 grains of native aerated barytes diftiblved in 240 

 of nitrous acid, whofe fp. grav. was 1,451, diluted with 5 times 

 its weight of water in a gentle heat afforded 384 grains of cryftal- 

 lized nitrated barytes, befides a fmall refiduum. 



Now 



