[ 4 - 8 + 3 
3- Of neutral falts formed with diftilled vegetable 
acids. 
4. Of neutral falts formed with flowers of benzoin 
and fait of amber. 
SECT. I. 
Of neutral falts formed with native vegetable acids , 
and the fojjil or mineral alkali . 
Experiment I. 
With the acid of lemons. 
The firft experiment I made was with the acid of 
lemons; fix ounces of the juice faturated rather 
more than three drams of the foflil alkali ; and upon 
evaporating the liquor to a pellicle, and letting it 
/land tor tome days, I obtained a fait compofed of a 
number of fmall cryflals of irregular figures ; fome 
appeared to be irregular fquares, or rhomboidal ; 
others irregular pentagons; others to have more tides ; 
but this general appearance was nearly what is repre- 
fented at a. a. a. &c. inTAB. XXIII. fig. 1. They were 
moftly flat, and not above 4 or of an inch thick ; 
though fome few were fomewhat of an oblong irre- 
gular cubical fhape, if I may be allowed to ufe the 
expreflion. 
Having obferved that the figure of neutral falts, 
made with vegetable acids, varied fometimes, ac- 
cording as they were cryftallifed in larger or lefs 
quantity, I got a quart of lemon juice, and faturated 
it with about two ounces, and two drams of the 
foflil 
