Mr. Richardson's Aiialyses of Farm-Yard Mamire. 23 

 line and chloraniline has in reality the following composition: 



2nd. The chlorindatmit of Erdmann is nothing but tri- 

 chloraniline. 



3rd. The name chlorindoptene merely denotes an indefinite 

 mixture of chlorindoptenic acid and trichloraniline. 



The formation of trichloraniline by the action of chlorine 

 on indigo is not at all surprising. The transformation of in- 

 digo into nitropicric and chlorindoptenic acids, and into ani- 

 line, proves sufficiently that there are present in this body the 

 conditions necessary for the production of all the members of 

 the phenyle series. The action of potash and of chlorine on 

 indigo is in this respect essentially the same. The only dif- 

 ference is, that in the first instance a pure product of oxida- 

 tion is obtained, whilst in the second a number of the hydro- 

 gen equivalents of this product is replaced by a corresponding 

 number of the oxidizing agent, viz. chlorine. In the one case 

 aniline is formed, in the other trichloraniline. The latest in- 

 vestigations of Cahours*, in which he succeeded in obtaining 

 salicylic acid by treating indigo with hydrate of potash, show 

 that out of this latter substance hydrate of phenyle can like- 

 wise be produced, the compound free from chlorine, which 

 corresponds to chlorindoptenic acid. 



In an analogous manner Erdmann f obtained, by the action 

 of bromine on indigo, bromlsaline, dibromisatine and bromin- 

 doptene. This last substance, distilled with potash, is decom- 

 posed into bromindoptenic acid and bromindatmit. Erdmann 

 did not analyse bromindatmit; but it is scarcely necessary to 

 remark that this body is nothing but tribromaniline(Fritzsche's 

 bromaniloid), r tj 



''2\B 



} 



VI. Analyses qf Farm-Yard Manure, and of Coal-Gas. 

 By Thomas RichakdsoNj Esq-X 



rjlHE accompanying analysis of farm^yard manure is part 



A of an investigation in which I am at present engaged, 



and the results show, rather unexpectedly, that this manure 



has a somewhat similar composition in different localities. 



* Compt. Rend. 



t Journ.fiir Pralct. Ckem., vol. xix. p. S.'jS. 



X Communicated by the Chemical Society; having been read February 

 17, 1845. 



