[ S°4 ] 
inch long ; they were moftly fixed to the fioes of 
the bafon by one end, many flood almoft upright, 
and others lay acrofs each other. One end was com- 
monly made up of two floor t files, which met at a 
point. 
They remained fome days expofed to the air in a 
cold room, and preferved their tranfparency and 
figure j but after they had flood for about a quarter 
of an hour in a warm room, while the painter was 
drawing the figure, they loft their tranfparency, 
and became white and mealy. They tailed cool, 
and fomewhat bitter in the mouth. 
SECTION III. 
Of neutral Salts , formed ‘with dijlilled vegetable 
Acids , and the fofjil Alkali . 
Acids diftilled from wood, and other vegetable 
fubftances, have been mentioned as a diftindt fpe- 
cies, but no proof has been brought of their dif- 
fering from the other vegetable acids ; on the con- 
trary, in the tables of neutral falts given by che- 
mifts, no notice is taken of any neutral falts made 
with thefe acids ; and therefore it is to be prefumed 
that they imagined them to be nearly of the fame 
nature with the others. 
In order to know if the'e acids differed from one 
another, and from the native and other acids, I 
had fome guaiac wood, fome fir wood, and fome 
honey diftilled, and procured fome of the acid of 
each, which I faturated, filtered, evaporated, and 
cryftallifed. 
Exp e 
