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twelve days in different tea cups and china bafons, 
there formed in each a number ot figures, or fort 
of cryftals, refembling fomewhat tlie alphabet ot 
the Chinefe language, interfperfed with a few fmall, 
oblong, parallelogram-fhaped cryftals, as at d, d, d . 
Three quarts more being faturated with the al- 
kali, were allowed to ftand for five or fix weeks, 
and then filtered and evaporated to about feven or 
eight ounces ; the greater part of which was put 
into a ftone bafon, and about half an ounce into a 
fmall china bowl ; after ten days, the liquor in the 
bowl had (hot into a number of fmall thin cryftals, 
fuch as reprefented at e, e } e -,— -and that in the ftone 
bafon into a fine pure fait made up of fimilar cry- 
ftals, but thicker and larger, fuch as thofe at fff- 
— Thefe laft are certainly the true laft cryftals of 
this fait. 
Experiment XII. 
With the acid of grapes. 
A bafket of grapes, which were brought to 
market for ripe, though many of them were ftill 
hard and four, and not come to their full perfection, 
yielded three quarts of juice, which I filtered and 
faturated with two ounces and a dram of the fof- 
fil alkali:— after it had flood for a month to depu- 
rate, it was again filtered, and then clarified with 
the whites of eggs, and evaporated to about five 
ounces, when it became of the confidence of a fy- 
rup, and had fomewhat of a fweetifh tafte. 
It was then fet in a cool place for two days to 
cryftallife; but, inftead of forming any regular 
cryftals, it concreted in form of a faline matter, 
Vol. LVII. Sff refem- 
