MR. SCHUNCK ON RUBIAN AND ITS PRODUCTS OF DECOMPOSITION. 411 
Hence the following composition may be deduced: — 
Carbon 
Eqs. 
32 
192 
Calculated. 
61*65 
I. 
60*96 
II. 
60*56 
III. 
61*17 
IV. 
60*95 
Hydrogen. 
12 
12 
3*85 
4*18 
4*23 
4*26 
4*25 
Chlorine . 
1 
35*4 
11*36 
11*21 
10*95 
11*10 
Oxygen 
9 
72 
23*14 
23*65 
55 
23*62 
23*70 
311*4 
100*00 
100*00 
100*00 
loo-uo 
The baryta compound I found to have no very simple composition. It was pre- 
pared, as above described, by dissolving crystallized chlororubiadine in ammonia, 
adding chloride of barium, filtering from a few flocks that were precipitated, and 
allowing to crystallize in an air-tight flask, filtering, washing with water, and drying 
in vacuo. 
0'8370grm. of the crystals lost, on being heated for some hours in the water-bath, 
0'0690 water=8‘24 per cent. 
0’5770grm. of the substance thus dried gave, when burnt with chromate of lead, 
T0965 carbonic acid and 0*1790 water. 
0*5660 grm. gave 0*1350 sulphate of baryta. 
These numbers lead to the formula 4 C 32 Hja Cl Og-j-SBaO, as the following com- 
parison between the theoretical composition and the experimental results will 
show : — 
Eqs. 
Calculated. 
Found. 
Carbon . . 
. . 128 
768 
52*05 
51*82 
Hydrogen . 
. . 48 
48 
3*25 
3*44 
Chlorine . . 
. . 4 
141*6 
9*59 
55 
Oxygen . . 
. . 36 
288 
19*54 
55 
Baryta . . 
. . 3 
229-8 
15*57 
15*65 
1475*4 
100*00 
The sugar which is formed, from chlororubian together with chlororubiadine may 
be obtained in a crystallized state, which is not the case with the different specimens 
of sugar derived from the other processes of decomposition to which I have subjected 
rubian. If sulphuric acid be employed for the decomposition of chlororubian, and 
the acid after filtration of the flocks of chlororubiadine be neutralized with car- 
bonate of lead, the filtered liquid yields on evaporation a sweet syrup. If this syrup 
be treated with alcohol, a part of it dissolves with a yellow colour. If the alcoholic 
solution, after separation from the insoluble part, be mixed with several times its 
volume of ether, it becomes milky and deposits again a yellow syrup, which after 
standing some time becomes filled with small yellowish crystals, so as almost to form 
a solid mass. This mass is pressed between blotting-paper, in order to remove the 
mother-liquor, and the crystals are dissolved in boiling alcohol, to which a little 
animal charcoal is added. The filtered solution on evaporation gives a syrup, which 
