Br. Schunck vn Rubian and its Products of Decomposition, 273 



crystalline flocks. The filtered liquid is almost colourless, and 

 contains sugar. The flocks consist entirely of a body, to which, 

 as it has the composition of rubiadine in which 1 equivalent of 

 hydrogen is substituted by chlorine, I shall give the name of 

 Chlororubiadine. It is purified by collecting the flocks on a 

 filter, washing them with water, and dissolving them in boiling 

 alcohol, which on cooling and standing, deposits yellow shining 

 crystals, which are larger than those of chlororubian. 



Chlororubiadine has the following properties. When cry- 

 stallized from alcohol and dried, it has the appearance of a yellow 

 mass, consisting of small shining crystalline needles and scales. 

 When heated on platinum it melts to a brown liquid, and then 

 burns with a yellow flame bordered with green, leaving much 

 carbonaceous residue. When heated in a tube it melts and 

 gives penetrating fumes, smelling of muriatic acid, and forming 

 on the colder parts of the tube a sublimate which is at first oily 

 but soon becomes crystalline. It is insoluble in boiling water. 

 Dilute nitric acid does not affect it, even on boiling. Nitric 

 acid of sp. gr. 1*52, however, dissolves it, even in the cold, 

 forming a dark orange-coloured solution. If nitrate of silver 

 be added to this solution, no precipitate is produced ; but if the 

 solution be boiled, an evolution of nitrous acid takes place, the 

 solution becomes turbid, and gives a copious deposit of chloride 

 of silver. Concentrated sulphuric acid dissolves it in the cold, 

 forming an orange -coloured solution, from which it is precipi- 

 tated again by water in bright yellow flocks. If the solution in 

 the acid be boiled its colour changes to a deep purple, without 

 much sulphurous acid being evolved, a small quantity of a white 

 crystalline sublimate making its appearance afterj some time on 

 the sides of the vessel near the surface of the liquid. Chlororu- 

 biadine is easily dissolved by caustic soda with a purplish-red 

 colour, and by ammonia and the carbonates of potash, soda and 

 ammonia, with a blood-red colour. The ammoniacal solution 

 loses its ammonia on evaporation, and leaves the substance 

 behind as a bright yellow residue. On adding chloride of ba- 

 rium to the ammoniacal solution, the baryta compound crystal- 

 lizes out on standing in long needles, arranged in large fan- 

 shaped or star-shaped masses of a beautiful red colour, while 

 the liquid becomes almost colourless. The baryta compound, 

 when treated with boiling water, only dissolves in part, some 

 chlororubiadine being left undissolved. If a current of carbonic 

 acid be passed through the filtered solution, the whole of the 

 chlororubiadine is precipitated in yellow flocks, the liquid be- 

 coming colourless. The ammoniacal solution gives with chloride 

 of calcium, after some time, a dark red uncrystalline deposit, 

 and also loses its colour. A boiling solution of perchloride of 

 Phil. Mag. S. 4. Vol. 12. No. 79. Oct. 1856. T 



