i. 24 - 
more difcoloured than that precipitated by Cunnamara kelp. The 
infoluble refiduum of an ounce amounted to 174 grains. 
VEGETABLE ALKALI, 
I rounp that 480 grains of the pureft and drieft falt of tartar 
(making allowance for the quantity of fixed air it contained) 
precipitated 331,5 grains of earth of allum. 
Dantzic Prart AsuH. 
Tue folution of one ounce of this falt precipitated in one 
experiment 200 grains of earth of allum; and in another 220 
grains; at a medium 210 grains. Then if 331,5 grains of this 
precipitate require 480 grains of mere vegetable alkali, 210 grains 
of this precipitate require 304; therefore at a medium an ounce 
of this fubftance contains 304 grains of mere alkali, and a pound 
contains 3648. By my analyfis it contained 3477 grains; the 
difference is 171 grains. 
? 
We may now determine which of two or more faline fub- 
ftances, one pofleffing the mineral, the other the vegetable alkali, 
is beft in its kind; for that fubftance is beft in its kind which 
approaches moft to its proper ftandard; 725, that is, the preci- 
pitation of 725 grains of allum being the ftandard of the good- 
nefs of an ounce of a fubftance containing the mineral alkali, 
and 331,5 being the ftandard of the richnefs of an ounce of a 
fubftance containing the vegetable alkali. Thus, if we compare 
barilha and Dantzic pearl afh, as the ftandard of barilha is to 
the quantity of earth of allum, an ounce of it precipitates, fo 
1S 
