70 
MR. SCHUNCK ON RUBIAN AND ITS PRODUCTS OF DECOMPOSITION. 
II. 0‘3630 gTm. rubiretine, prepared by means of caustic baryta, gave 0'9130 car 
bonic acid and 0*1715 water. 
These numbers correspond in 
100 parts to — 
I. 
II. 
Carbon . . 
.... 68-60 
68-59 
Hydrogen . 
.... 5-32 
5-24 
Oxygen . . 
.... 26-08 
26-17 
I did not obtain a sufficient quantity of verantine in a pure state for the purpose 
of analysis, but the properties of the substance formed by the action of alkalies on 
rubian corresponded so exactly with those of the verantine produced by the action of 
acids, as to leave no doubt of their identity. 
The compound of sugar and baryta, obtained by the action of baryta on rubian, is 
similar in appearance to the sugar itself. Its colour is light brown, and when dry it 
is brittle and transparent like dried gum or varnish. It exhibits no trace of crystal- 
line form. It is more easily reduced to a state of dryness than the sugar itself, and 
deliquesces much less when exposed to a moist atmosphere than the latter. When 
its solution is mixed with acetate of lead, the whole of the sugar seems to be precipi- 
tated in combination with oxide of lead. On analysing a specimen of this substance 
prepared by precipitating the excess of baryta with carbonic acid, I obtained the 
following results : — 
I. 0-6375 grrn. heated for several hours in the water-bath, gave 0-5245 carbonic 
acid and 0-1945 water. 
II. 0-7575 grin, gave 0-6320 carbonic acid and 0-2235 water. 
0-4860 grrn. gave 0-3480 sulphate of baryta, equivalent to 0-22838 baryta. 
From these numbers may be deduced the following composition 
Carbon . . 
Eqs. 
. . 12 
72 
Calculated. 
22-20 
I. 
22-43 
II. 
22-69 
Hydrogen . 
. . 11 
11 
3-39 
3-39 
3-26 
Oxygen . . 
. . 11 
88 
27-14 
27-O6 
Baryta . . 
2 
153-2 
47-27 
46*99 
324-2 
100-00 
100-00 
If the baryta contained in the solution of sugar be precipitated with sulphuric 
acid, and the latter be again neutralized with carbonate of baryta, there is obtained, 
as I mentioned above, a compound of sugar and baryta containing less baryta than 
the preceding. Its analysis yielded the following results : — 
I. 0-4330 grm. gave 0-4670 carbonic acid and 0*1825 water. 
II. 0-3770 grm. heated for several hours longer at 100° C., gave 0*4150 carbonic 
acid and 0*1570 water. 
0*3890 grm. gave 0-1890 sulphate of baryta, equivalent to 0*1240 baryta. 
