480 



and in a state of great purity, and the author had thus an oppor- 

 tunity of examining the properties and composition of this substance 

 more accurately than heretofore. From the new analyses which he 

 made he infers that its formula is 



which differs from 



CTT f\ 

 32 n !2 ^8' 



the one formerly given, by 1 equiv. of water. 



Action of Chlorine on Rubian. 



When chlorine gas is passed through a watery solution of rubian, 

 the solution deposits lemon-yellow or orange-colour flocks and be- 

 comes colourless. The flocks consist of a peculiar substance, which 

 the author calls Chlororubian. The liquid contains sugar. Chloro- 

 rubian crystallizes from its solution in alcohol in small orange- 

 coloured needles. It is soluble in boiling water, but not as easily 

 as in alcohol. On being heated, however carefully, it is decomposed. 

 It is dissolved by caustic and carbonated alkalies, forming blood -red 

 solutions. The baryta and lime compounds are red and insoluble. 

 The watery solution produces with basic acetate of lead a light red 

 precipitate. The author gives for the chlororubian the formula 

 r< TT /""ir* 



U 44 H 27 ^ 1U 24' 



Its formation from rubian is represented by the following equation : 

 C M H^ Oao + 6HO + 201=0^2701024 + C 12 H 12 O 12 + 2C1H. 



Chlororubian is decomposed by strong acids and splits up into 

 sugar and another body, which has the formula 



and which, in consequence of the relation in which it stands to 

 rubiadine, the author calls Chlororubiadine. The manner in which 

 this process of decomposition takes place will be seen from the 

 following equation : 



C M H 27 C10 24 =C 32 H 12 C10 9 + C 12 H 12 12 + 3HO. 



Chlororubiadine is soluble in alcohol. The boiling solution de- 

 posits it on cooling in yellow shining needles. It is insoluble in 

 boiling water. It is not decomposed by dilute nitric acid or on 

 boiling, but nitric acid of sp. gr. 1*52 dissolves, and on boiling 



