[ s°2 ] 
with the other neutral falts made with vegetable 
acids. 
Experiment IV. 
With the acid of verjuice of Apples. 
I made two trials with the verjuice; the fir ft was 
with a quart of what was old and tart, and took 
rather above an ounce of the alkali to laturate it; 
the other, which was newer, not fo tart, and was 
faturated with about feven drams of the alkali. 
The firft was evaporated to a few ounces, when 
an oily or mucous pellicle appeared on the top; 
after letting it ftand for fome days, no fait was likely 
to cryftallile; I therefore diluted it with water, 
filtered it, clarified it with the white of an egg, and 
evaporated it a fecond time ; and aftei it had ftood 
for fome days the fait concreted into the form re- 
urefented by fig. 16. It was compofed of a num- 
ber of fm all long cryftals, which branched out 
from centres fomewhat like the fticks of a fan, or 
the fibres in the leaf of a tree, fuch as at a, a, a. 
The fecond or new verjuice, after being fatu- 
rated, was allowed to ftand for four or five weeks, 
then filtered, purified witfqthe white of an egg, and 
evaporated ; and after Handing fome days in a cool 
place, a cryftallifation was formed, which ap- 
proached very near in its appearance to the fait of 
apples, though fomewhat different; it was com- 
pofed of a number of very fine delicate fmall, flat 
lquare or rhomboidal plates fet upon their edges, 
near to one another, without any certain regular 
order 
3 
