481 



decomposes it, and nitrate of silver now gives a precipitate of chlo- 

 ride of silver. Chlororubiadine dissolves in caustic and carbonated 

 alkalies with a red colour. With baryta it gives a compound, crystal- 

 lizing in long red needles. The author did not succeed in convert- 

 ing rubiadine into chlororubiadine, nor, on the other hand, was he 

 able to substitute the chlorine of the latter by hydrogen, and thus 

 form rubiadine. 



The sugar which is formed from chlororubian, together with chlo- 

 rorubiadine, may be obtained in a crystallized state, when it has the 

 properties and composition of crystallised grape-sugar. 



When chlororubian is treated with caustic soda, the chlorine is 

 entirely separated, forming chloride of sodium. The other products 

 of decomposition are verantine, rubiretine, a body resembling rubia- 

 dine, sugar, and a yellowish-brown substance insoluble in water, 

 in alcohol, and even in alkalies, the probable formula of which is 



C 44 H 1412' 



and for which the author proposes the name of Oxyrubian, since it 

 owes its formation to the chlorine of chlororubian being replaced by 

 oxygen. 



By the continued action of chlorine chlororubian is converted 

 into a white body, which the author calls Per chlororubian. This 

 body is insoluble in water and caustic alkalies, but soluble in alcohol 

 and ether. It crystallizes from the alcoholic solution in colourless, 

 transparent, four- sided tables, exhibiting a beautiful iridescence. 

 When carefully heated it may be entirely volatilized. It is not de- 

 composed by nitric acid of sp. gr. 1'52, even on boiling, but is 

 merely dissolved. Its composition is expressed by the formula 



C 44 H 9 C1 9 15- 



From these experiments it follows that chlororubian is a conju- 

 gate body containing sugar. In this respect it resembles Piria's 

 chlorosalicine. 



In all processes of decomposition previously described rubian yields 

 three series of compounds, just as if it consisted of three bodies. 

 When acted on by chlorine, however, it yields only one series of pro- 

 ducts, which corresponds exactly with one of the three series of the 

 other processes, the bodies belonging to the two other series not 

 making their appearance, even in the form of products of substitution. 



