280 Dr. Schunck on Rubian and its Products of Decomposition, 



0-3610 grm. of this substance, diied at 100° C, gave 0-8620 

 carbonic acid and 0-1060 water. 



0-2920 grm. gave 0-1110 chloride of silver. 



In 100 parts it contained therefore-TniU!, -^ 



. MuuHvr^ . Carbon . . .-i-ii^t^^^ 

 ii;urtKn3hjibii Hydrogen. . Mvoqi9fW, ^'^^V 

 aonrJedue Chlorine . . . .' 9*^9 



oJ °« no\- Oxygen .... 22*23 



Should the body formed from chlororubian by caustic alkalies 

 be found to contain 44 equivalents of carbon, the most appro- 

 priate name for it would be Oaryruhiani 



The liquid filtered from this body is still red. On adding to 

 it sulphuric acid, a yellowish-brown flocculent precipitate falls. 

 This precipitate consists of several bodies. If after being filtered 

 and washed it be treated with boiling alcohol, a part dissolves, 

 leaving undissolved a dark brown substance, which after drying 

 becomes black. This substance is doubtless a product of the de- 

 composition of sugar, as it has the same properties and very nearly 

 the same composition as the body, insoluble in alcohol, which 

 I obtained by the decomposition of rubian with caustic soda*. 



0-1760 grm. of this substance gave 0-4360 carbonic acid and 

 0-0650 water, corresponding in 100 parts to — 



]^ Carbon .... 67*56 



Hydrogen. . . . 4-10 

 Oxygen .... 28*34 



On adding acetate of lead to the liquid filtered from this pre- 

 cipitate, a brown precipitate falls, which after being filtered off, 

 washed with alcohol and decomposed with boiling muriatic acid, 

 yields brown flocks. These, on being dried and treated with 

 cold alcohol, yield to the latter a body resembling and probably 

 identical with rubiretine, while a brown powder is left undissolved, 

 having the properties and composition of verantine. 



0*1755 grm. of the latter, after being purified by redissolviug in 

 a boiling mixture of alcohol and ammonia, then adding an excess 

 of acetic acid, collecting the pulverulent deposit formed on cool- 

 ing, and washing with alcohol, gave 0-4170 carbonic acid and 

 0-0680 water. 

 . fe ,100 parts it contained therefore — 



Carbon .... 64*80 



Hydrogen .... 4*30 



> -' Oxygen .... 30'90 



^ Tfaif liquid filtered from the lead precipitate is yellow. It 

 giy^^ with water a yellow precipitate, which, after being filtered 



