[ 4§3 ] 
As I always fufpeCted, from the tafte and fmell 
that vegetable acids differed materially from one 
another, and was the more confirmed in this opi- 
nion by the above experiment mentioned by Dr. 
Vogel, I began to confider whether fome method 
might not be fallen upon to determine this queftion ; 
and, on recollecting, that the Rochelle fait * con- 
creted into large folid cryftals, which preferved 
their figure long, even in the open air, though the 
tartarus tartarifatus -f* always appeared in the form of 
a powdery foliated fait, and run very foon per deli - 
qiuum , when expofed to the air, I imagined, that 
if we were to unite the foftil, or mineral alkali, with 
different vegetable acids, we fhould be able to ob- 
tain true neutral falts in form of regular cryftals; 
which would fhew how far thefe acids differed or 
approached to each other in their nature and proper- 
ties ; and, upon trial, found that I had judged right ; 
for each particular acid almoft yielded a neutral fait 
pecauliar to itfelf, of which I fhall now give a parti— 
culr account, and fhall range thefe falts under the 
following heads. 
1 . Of neutral falts formed with native vegetable 
acids. 
2. Of neutral falts formed with fermented vege- 
table acids. 
* The Rochelle fait is made with the cryftals of tartar, and 
the foflil alkali. 
f The tartarus tartarifatus, with the cryftals of tartar, and 
the fait of tartar ; fo that the only difference between thefe two 
falts is, that the one is made with the foflil, and the other with 
the vegetable alkali. 
Q_q q 2 3. of 
