20 5 
and Observations on Lac. 
The whole of the solutions in alcohol were then poured into 
distilled water, which was heated, and an attempt was made to 
separate the precipitated substance by filtration; but, as this 
did not succeed, on account of the filter speedily becoming 
clogged, the whole was subjected to gentle distillation; by which, 
a brownish-yellow resin was obtained, amounting in weight to 
136 grains. 
C. The remainder of the lac was again digested in boiling 
distilled water; by which, 2 grains of the colouring extract 
were obtained. 
D. The residuum was then digested with one ounce of mu- 
riatic acid diluted with two ounces of water, which, by boiling, 
became of a bright pale red, but changed to purple, when 
saturated with a solution of carbonate of potash. 
A flocculent precipitate was thus obtained, which possessed 
the characters of precipitated vegetable gluten combined with 
some of the colouring extract ; this, when completely dried, 
weighed 11 grains. 
E. There now remained 25 grains, which evidently consisted 
of a sort of wax, mixed with small parts of twigs and other ex- 
traneous substances. 
A part of the wax was separated by heat and pressure in a 
piece of linen ; and another portion was separated by digestion 
in olive oil, which assumed the consistency of an unguent. 
The residuum was then boiled with lixivium of potash, and 
became tinged with purple, in consequence of some of the co- 
louring extract which had not been dissolved by the preceding 
operations. 
The undissolved part, now consisting only of the extraneous 
vegetable and other substances, weighed 1 3 grains ; so that the 
