— 
rT @ 1 
‘Fiment I reafoned thus ?: 28 grains of a refiduum of this: fort con- 
tained 106 grains 6f- fixed air, ‘therefore’ the 279 grains: fubjected 
to’ the vinegar in’ this éxperimient gaufti‘have contained o109324 
which wete diffipated bythe a@sor of the acid ;. there remained 
therefore of mere earth only 173576%3but! of. thefe 63 efcaped 
the , oF bey eae erage nae were ei Aa aM 
éarth; “(the barytie ‘Baie Hote “Expedied) thé ‘110° 56 that were 
diffolved mutt have confifted of ‘eithet or both’ of: thefe, ‘and’ the 
indiffolved 63 grains: mane have been ar gillaceous ‘of filicedts.” 3 
BER Oop. 1 rose be HITE 9) [ 
To determine the firfe exe r ‘diftitiea” ina sleet retort rithe 
acetous folution, which was very yvoluminuus, until no more than 
about four pints Pane nicd: During the diftillation fome earth was 
depofited: which when dried ina red heat amounted to 4 grains 5 
this I're-diffolved, and finding it precipitable by cauftic’ volatile, 
alkalitjudged itto be magnefia. I then took as much of the acefous 
folution as. amounted to + of the whole, and pouring cauftic volatile 
alkali upon it, obtained nearly 3 grains or more exactly 2,83 grains 
of magriefia precipitated by the alkali. Whente I coficludéd /the 
whole folution.to contain 17. grains,to which adding the.4,.grains 
depofited, we have the intire quantity of magnefia diffolved by 
the vinegar =21 grains, and conféquently the remainder of 1 re 
grains, amely 89,76, muft havetbeen caleareous-earthé os .iit 
I Also examined the quantity <of)this earth in another man- 
ner; to,the ~ of the acetous agen that remained I added gra- 
dually. ieee acid, whofe fpecific gravity was 1,463, as long as 
any precipitation appeared to take yplace, then pouring off the 
yecea I edulcorated the refiduum, and having dried it found it 
WOV + Cc to 
