8 [March 6, 



action of concentrated hydrochloric acid is the compound with three 

 equivalents of acid, 



C 20 H 10 N 3 ,3HC1. 



Exposed to 100 this salt gradually loses acid, the brown crystals 

 becoming indigo-blue ; and if the exposure be continued until the 

 weight becomes constant, the original green salt with one equivalent 

 of acid is reproduced, which was identified by analysis. 



The two chlorides combine with dichloride of platinum. The 

 compounds thus produced, being uncrystallizable, are not easily ob- 

 tained in a state of purity. From platinum-determinations, which 

 have given only approximative results, I infer that they contain 

 respectively, 



C 20 H 10 N 3 , HC1, PtCl a and 

 C ao H 19 N 3 ,3HCfl,3PtCl 3 . 



The Hydrobromate of Rosaniline resembles in every respect the 

 hydrochlorate ; it is even more difficultly soluble than the latter j 

 it contains 



C 20 H ]9 N 3 ,HBr. 



Hydriodate of Rosaniline. Green, very difficultly soluble needles 



of the composition 



C 20 H in N 3 ,HI. 



Sulphate of Rosaniline is readily obtained by dissolving the free 

 base in boiling dilute sulphuric acid. On cooling, the salt is deposited 

 in green metal-lustrous crystals, which by one rccrystallization be- 

 come perfectly pure. At 130, at which temperature it loses a small 

 quantity of water, the formula of the salt is 



c 20 ii lo N 3 ,in so 



C 20 H 10 N 3 ,1I/ SO <- 



The acid sulphate crystallizes with difficulty. I have not ana- 

 lysed it. 



Oxalate of Rosaniline. The preparation and properties of this 

 salt are similar to those of the sulphate. The salt retains at 100 

 one equivalent of water, and is at this temperature represented by 

 the formula 



The water may be expelled at a higher heat ; but the temperatures 

 at which the water is lost and the salt commences to be decomposed 

 are so close to each other, that it is not quite easy to obtain the salt 



