V 
. [■' 114 ] ^ 
CHAP. XV III. 
Salt of Lead. 
T HIS Salt, which from the Sweetnefs 
of its Tafie is ufually called Sugar of 
Lead, is prepared from Cerufe or White Lead 
digefled with difidlled Vinegar in a Sand 
Heat to a Dilfolution : then evaporated till a 
Film arifes, and fet in a cold flace to cry- 
flalize. It is therefore Lead reduced into 
the Form of a Salt by the Acid of Vinegar, 
for Cerufe is itfelf nothing elfe but the 
Ruff of Lead corroded by Vinegar. 
A little of this Salt diffolvect in hot Water, 
which it immediately renders milky, after 
Handing a Quarter of an Hour to fubfide, is 
in a fit Condition for an Examination by the 
Microfcope. A Drop of it then applied on 
a Slip of Glafs, and held over the Fire to 
put the Particles in Addon, will be feen 
forming round the Edge a pretty even and 
regular .Border, of a clear and tranfparent 
Film or glewy Subftance ; fSee Plate IV. 
N° I. a a a a.) which, if too fudden and 
violent Heat be given, runs over the whole 
Area of the Drop, and hardens, and fo 
fixes on the Glafs, as not to be got off with¬ 
out much Difficulty. But if a moderate 
Warmth be made ufe of (which likewife 
mufi not be too long continued) this Border 
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