504; Dr. Hofmann on the Metamorphoses of Indigo. 



long needles. As this substance is very volatile, a cooling 

 apparatus must always be employed in this distillation. 



Trichloraniline is very little soluble in water, but dissolves 

 readily in alcohol and a?ther. The solution has a neutral 

 reaction. It does not unite with bases or acids, and can be di- 

 stilled unchanged from water containing either acid or alkali. 



This substance is obtained only in small quantities. My 

 whole amount, after the qualitative determination of chlorine 

 and nitrogen, was just sufficient for one analysis, which un- 

 fortunately did not turn out very good, but could not be re- 

 peated from the fact already mentioned. By burning with 

 chromate of lead the following results were obtained : — 



0'3020grm. of the substance gave O'llTOgrm. of carbonic 

 acid, 0*0665 grm. of water. In the 100 parts — 



Carbon . . . 37'65 

 Hydrogen . . 2*44 



The formula is Cjgs pi'* > N. The theoretical constitution is 



12 equiv. Carbon = 900*00 36-66 



4 ... Hydrogen = 50*00 2*03 



3 ... Chlorine =1327*95 54*09 



1 ... Nitrogen = 177*04 7*22 



2454*99 100- 



It may perhaps appear bold to give an opinion as to the con- 

 stitution of this body from a single determination of its carbon 

 and hydrogen, which, besides, does not agree very well with 

 the theory. When however we consider the complete ana- 

 logy in the mode of formation of tribromaniline and chlorodi- 

 bromaniline, to which I shall afterwards return, and the exact 

 resemblance in the properties of these bodies, less doubt may 

 perhaps be entertained. 



It appeared to me also to be worth the trouble of^ndeavour- 

 ing to form a base which contained bromine as well as chlo- 

 rine. Such a body could with ease be obtained, were it pos- 



J CI 



■sible to form a chlorobromisatine, Cjg-^ CI > NO4. Distilled 

 with hvdrate of potash, this compound would yield chloro- 



brominated aniline, C12 ■< Cl )- N. For this purpose, I poured 



LBrJ 

 on chlorisatine in a retort an excess of bromine, allowed the 



whole to remain for twelve hours, and then heated it in a 



water-bath to the boiling-point, until the excess of bromine 



