286 M E xM O I R S oj the 
ftrain thro' moift paper or a filter, fo as that it may become a? 
clear aspoflible; then put the lee into a glafs veffel, and let it 
remain in "Bcdneo Mar ice untill fuch timf as a great part of it 
evaporates, according to the proportion obferved by luch as are 
uled to thefe operations, and as the congelation of the fait is 
defired to be more or lels expedited or retarded. 2. If you keep 
the lee to evaporate by the fire, in glazed vefiels of earth, you 
will lofe a great quantity of the falts, for as the lee grows thick, 
the fait penetrates the bottom and fides of the vef{els of earth, 
jind is lofl. 3. The quantity of water to make the lee off is not 
determined, for the moll: part five pounds of water will extraft 
all the fait from two pounds of afhes. 4. The afhes, whereof 
you have already made the lee, and out of which you have ex- 
tracted the fak, may, if you burn the fame in a brick furnace; 
make another new lee, which ufually yields fome fmall portion 
of fait. 5. The falts, extracted in the manner aforeiaid, when 
the air is moid, are wont to melt j to obviate this inconveniency, 
when you burn the materials in order to reduce them to afhes, it 
is requifite to ule with them a proper quantity of fjlphur3 and if 
it happens that the afhes are made to your hand, you rnay mix 
them with fulphur, and keep the fame at the fire, till fuch tim^ 
as it be burnt- by this means, the fait will never come to run, 
but become more white and cry ftal line. 6. There is no general 
rule for the quantity of fulphur to be put into the materials you 
thus burn 3 you may nevertheleis at a guefs lay, to 100 pounds 
of materials 4 or 5 ounces of fulphur are ufjally fufficient. 7. AH 
falts have a peculiar and determined figure, which they always 
keep, altho' they are often relolved into water, and afterwards 
congealed. 8. If in one only liquid, you diflolve together two or 
three forts of falts of different figures, when they congeal, they 
all affume their ancient and proper figure, and this happens not 
only in fadlitious, but alio in mineral falts. If in a veflel fiill of 
water, you diffolve equal or unequal quantities of vitriol of 
Cyprus, rock allum, and of purified nitre, this water will be all 
of an azure colour ; but when the water is evaporated, you will 
obferve in the veffel, that th'e vitriol, the allum, and the nitre, 
have re-affumed diftinftly their firfl figure, and that the vitriol 
hath recovered its moft complete azure colour, leaving the nitre 
and the allum with their ufual tranfparent whitenefs. 9. Aliho' 
it belaid above ^ fiftat all falts have a proper and particular 
figure, yet notwithftanding all this, fome forts of falts are ob- 
ferved to have 2, 3, and 4 forts of figures 3 two forts have been 
fcen in Icttice, in the Scorzoneroh^ m the mulk-melon, the 
Sco^a, in the roots of Efula, in the black hellebore, in endive, 
in 
