55 
the filtrate evaporated to small bulk and dried in an air-bath 
at 1 00° C. until the weight remained constant. This is put 
down as the part soluble in alcohol in the above analysis. 
The residue was then treated with hot water and the filtrate 
evaporated and dried at 100° and weighed as gum. The 
residue after the gum had been removed was then washed 
and dried on weighed filter at 100° C. and weighed as 
residue. The moisture and other volatile matter were of 
course determined by the difference. 
The estimation of the amount of part soluble in alcohol 
after the lacquer has been exposed to the sunlight in open 
vessel for some 20 or 30 days shows that the soluble part 
increased up to 72-82 per cent. This number when calcu- 
lated for the substance to have lost 28 per cent moisture 
and other volatile matter during exposure, then equals to 
58*3 per cent, which is nearly equal and practically the 
same as the analysis previously given, hence there seems to 
have been no material change in the amount of matter 
soluble in alcohol. Now the perfectly dried lacquer after 
finely powdered was dried at 100°, and analysis gave 
Fart soluble in absolute alcohol 18*07 
Gum 3*63 
Kesidue 78-30 
100-00 
Altogether from this analysis, the residue being increased, 
the lacquer seems to have undergone some change, but pos- 
sibly this is owing to the fact, that the alcohol as well as 
water seem to have had less complete access to the material. 
Thus the “ Urushi” consists of three principal constituents, 
(1) a resinous part soluble in alcohol, (2) gum, and (3) 
residue. Although there are, in addition to these, water and 
volatile matter, as they go away sooner or later before it is 
used, they are not properly called the constituents. 
(1.) Part soluble in alcohol (resin) seems to be the principal 
