L 2s] 
is the ftandard of Dantzic to the quantity an ounce of it pre- 
cipitates ; or 72521742! 33155! 79955 by which we fee that an 
ounce of Dantzic falt that would precipitate 79,5 grains of earth 
of allum would be as good in its kind as an ounce of barilha 
that ‘ precipitates 1743; therefore fince an ounce of Dantzic falt 
precipitates 210, it is Ticher in its kind by the difference between 
79,5 and 210. i : 
Wirn refpeé&t to antacid powers the mineral alkali is 
ftronger than an equal quantity of the vegetable, that is, will 
faturate more acid, nearly in the proportion of 48 to 22; yet 
- it attraéts acids lefs, that is, with lefs force and activity, fince 
the vegetable will take them from the mineral alkali. But if 
the quantities of real alkali be unequal we may compare 
their antacid powers in this manner: As the precipitate by 
an ounce of a fubftance containing the mineral alkali is to 
48, fo is the precipitate by an ounce of a fubftance containing 
the vegetable alkali to a number exprefling its comparative ant~ 
acid power. Thus with refpect to barilha and Dantzic falt, as 
174:48:: 210: 58 nearly ; therefore the antacid power of Dantzic 
falt is greater than that of barilha, when taken in equal quantities 
in the ratio of 58 to 48. 
CASHUP. 
Tue beft fort, namely, that marked with the crofs arrows, is 
of a bluifh grey colour, exceeding hard and of a femivitrified 
appearance, its fmellifulphureous, its tafte fearcely alkaline, and 
does not attract the moifture of the air. With marine acid, one 
E ounce 
