m4 
n 
°o 
| 
Sweet BarILHa, 
Tue folution of one ounce of barilha precipitated 174 grains of 
earth of allum; therefore, fince 726 grains of earth of allum 
require for their precipitation 480 of mere mineral alkali, 174 
grains of that earth require 115,2 of mere mineral alkali. And 
confequently one ounce of barilha contains but 115,2 of mere 
alkali; and one pound of barilha fhould contain 1382,4 grains, 
This quantity exceeds by about 4 the quantity I found by direct 
analyfis, but poflibly one pound may contain more than another, 
for it could fearcely happen that I fhould commit a miftake of that 
magnitude. 
I must not here omit an odd appearance that occurred in this 
experiment: The earth of allum in drying acquired a bluifh 
colour, and when fpirit of falt was poured on it, to difengage the 
fixed air it might contain, the blue colour was more developed, 
and fome blue particles floated in the liquor. This feems to 
proceed from the tinging matter of Pruffian blue which has been 
found in barilha. The weight of this I have not examined, but 
it could not exceed I or 2 grains. 
CuNNAMARA Ke Lp. 
Tus was manufactured by Mr. Martin Mealy, and fent to me 
by Mr. Francis French, an eminent merchant in this city. It 
is a hard porous black fubflance, mixed with white and grey 
fpots, its fmell fulphureous, and its tafte mixed, being that of 
common falt and alkali. One ounce of it diffolved in marine 
acid 
