Dr. Hofmann on the Metamorphoses of Indigo, 513 



solved in a great excess of acid and placed under a bell-glass 

 with caustic lime. After some time crystals are obtained, 

 which are only slightly soluble in water, and consist almost 

 entirely of pure base. The elasticity of the hydrochloric acid 

 is thus sufficient to overcome the affinity between it and the 

 base. 



G. Tribromaniline {Amabrophenose), C^^-l t^^ >N. 



This compound has been long since described by Fritzsche* 

 and named by him bromaniloid. He obtained it by treating 

 aniline with bromine. It forms with the same facility by the 

 action of the same body on bromaniline or dibromaniline. 



I have prepared this body from bromaniline. The hydro- 

 chlorate of this base gives with a solution of bromine in water 

 a white precipitate with a tint of violet. As the violet colour 

 did not disappear by re-crystallization from alcohol, I sub- 

 mitted the compound to distillation. At the commencement 

 of the distillation there are condensed in the receiver beau- 

 tiful snow-white crystals ; towards the end however the violet 

 accessory product also passed over, and could not be re- 

 moved again by recrystallization from alcohol. Although the 

 properties and mode of formation of this body left no doubt of 

 its identity with bromaniloid, I however made a combustion 

 of it. Unfortunately, as stated, the substance was not per- 

 fectly pure, hence the proportion of carbon is too high. 



0*3305 grm. of substance gave 0*2800 grm. of carbonic 

 acid and 0'04;50 grm. of water; corresponding in the 100 

 parts to 



Carbon . . . . 23*10 

 Hydrogen . . . 1*51 



The formula will therefore be C^A j^f >N, which requires 



Carbon . . . . 22*15 

 Hydrogen . . . 1*22 

 Tribromaniline is not a base but an indifferent substance, 

 and does not combine with bases or acids. I must refer to 

 Fritzsche's memoir for the description of its properties. 



The following table exhibits the formulae of the different 

 bodies which form the subject of this paper : — 



Aniline . . .l^^.H^N 

 Amaphenase ' > j 12 7 



Substitution of the hydrogen by chlorine, 



Chloraniline . .\_/-i rH6\|^ 



Amachlophenese »j~ '^\Clj 



* Bullet. Scient. de St. Petersb., 1843, t. i. p. 30. 



Phil. Mag, S. 3. Vol. 26. No. 175. June 1845. 2 M 



