[ 4^9 ] 
neutral fait very different in its appearance, from 
any of thofe hitherto mentioned. Its bafis, or what 
adhered to the tea-cup, was made up of a number 
of very fmall roundifh or fquarifh cryflals; which 
formed an incruftation thicker than a {lulling ; from 
which grew up a number of very line, thin, tran- 
fparent plates, of irregular fhapes ; they were nar- 
rower at the bafis than above j and in fome meafure 
might be compared to the fcales of a fmall ffh, or 
the wings of flies, fet on their edges at a little 
diftance from one another ; in forne places the 
plates arofe from the fides of others ; and in others 
they appeared fomewhat like the fine leaves of 
very fmall plants. In fig. 6. we have different view's 
of this fait ; a . a. reprefents a piece of cryftallifed 
fait viewed from above ; b. b. a profile view of 
the thin plates {landing on their bafis ; c. c . the bafis 
itfelf ; and the letters d. a view of the thin plates laid 
on their flat fides. 
Experiment VII. 
With the acid of apples. 
Having got two dozen of codling apples, I cut 
them to pieces, put them into a large earthen veflefl 
and poured three quarts of water upon them ; and 
then diflblved above two ounces of the fofiil alka- 
line fait in the water, and let them fiand for fix 
days ; on examining, I found the water to be nearly 
in a neutral flate ; it did not ferment on the addi- 
tion either of an acid or of an alkali. I then fil- 
tered the liquor through paper, and evaporated it, 
Vol. LVII. R r r till 
