[ 279 ] 



Amd roo grains nitrous acid fliould take up +0,35 of vol-alkali,. 

 and afford 175^4+ of ammoniac, if no lofs &c. 



An experiment of my own, related in my lall paper, feems to 

 contradidl thefe refults, for I there ftated that 200 grains aerated, 

 vol-alkali, which contained 50 per cent, of fixed air, and confe- 

 quently the whole, 46 of vol-alkali, having been faturated with 

 nitrous acid, to have afforded 296 of nitrated ammoniac, whereas 

 by calcvilating from the above flatements they fhould afford buf 

 200 : but the reafon is, that the niafs of fait then procured was 

 not wholly cryftallized, but contained much of the mother liquor 

 and an excefs of acid which increafed its weight. The only ob- 

 jedl I had then in view was to fhew that the weight obtained was 

 lefs than could be expedted from the theory 1 had then formed,' 

 for this purpofe it was not neceffary to pufli the deficcatioti very- 

 far — a decompofition alfo took place as will prefently be feen. 



According to Wenzel 240 grains of dry uncryflallized ni-. 

 crated vol-a'kali contain 155,9 of his ftrongeft acid, 77,5 mere vol- 

 alkali and 6,6 water: then 100 grains of this fait fhould contain 

 64,95 acid, 32,29 vol-alkali, and 2,76 water, i 23 grains of his 

 aerated vol-alkali which contained 53,75 of fixed air, being fatu- 

 rated with nitrous acid, afforded him in one experiment 127 of 

 nitrated vol-alkali, and in another 123; by my calculation, this 

 quantity of vol-alkali fliould afford 132,6 of the cryf^allizei: 

 fait. 



CoRNETTE.- 



