ff a J 
‘took up 82,5 of his ftrongeft acid, and 100 fhould take up 238, 
equivalent to 264 of my ftandard. 
Of the Relation of Marine Acid to Magnefia. 
By my experiments 100 parts pure magnefia take up 215,8 
of the muriatic ftandard. According to Mr. Wenzel, 106 gts. 
of aerated magnefia faturated 240 of his {pirit of falt, which 
contained 54 grs. of his ftrongeft acid, equivalent to 112 of 
ftandard. But if his magnefia contained 45 of its weight of 
pure earth, then 106 contained but 47,7, and ‘in that cafe 100 
parts pure magnefia fhould take up 234 of the marine ftandard. 
Of Allum. 
_ Tue proportion of ingredients in this falt I endeavoured to 
difcover by decompofing it. 
1°. To afcertain the proportion of earth, I diffolved 480 grs. 
of this falt in 2880 of water, ‘and precipitated the earth by a 
folution of mild volatile alkali, both being heated the precipitate 
after edulcoration was heated to 465° it weighed 141 grs. Hence 
-Ioo parts allum contain 29,37 of earth in that ftate of drynefs 
which the heat abovementioned can produce. 
2, To find the proportion of water of cryftallization, I dif 
tilled 480 grs. of allum in a heat of 465° and obtained 200 grs. 
I 2 of 
