[ 199 I 



Hence ift. 42 grains of deficcated Glauber arc equivalent to 

 100 of the cryftallized. 



Hence 2dly, 100 grains deficcated Glauber fhould give, or are 

 equivalent to, 238 of the cryflaUized, that is, they contain the fame 

 quantity of alkali and acid as 238 of the cryftallized. 



Hence 3dly, 100 grains of foda faturated with vitriolic acid 

 fhould give 541 + of cryftallized Glauber, or 227 of deficcated 

 Glauber, and 100 parts cryftallized foda fhould give 116,77 of cry- 

 ftallized Glauber; or 49 deficcated Glauber, and 100 grains real 

 vitriolic acid fhould give when faturated with foda (whether cry- 

 ftallized or not) 425 4- of cryftallized Glauber or 178,5 of deficcated. 



But thefe quantities of deficcated or cryftallized fait are never 

 txaSlly obtained, on account of^the lofs by evaporation, and of 

 what remains in the mother liquor. 



Application. 



On the Proportions in aerated SoDa. 



Experiment iji. Dr. Black's. 3 Edinb. Tranf. 1 06. 



His quantities being fradionary to render the calculation clearer,. 

 Fl multiply all into 1000, 



Hs 



