OP ARTS AND SCIENCES. 145 



it, but chlorauric acid threw down an uninviting precipitate, which 

 we thought was in part at least a product of oxidation. If the sub- 

 stance formed was really hexamidobenzol, it is evident that its isola- 

 tion in a form fit for analysis will be a matter of great difficulty owing 

 to its extreme instability. The study of this subject will be continued 

 ,in this laboratory, however, as soon as a sufficient quantity of material 

 can be prepared, and the work will be extended also to the action of 

 other reducing agents, including those which form azo-compounds. 



As yet we have been unable to finish the study of the substances 

 contained in the orange-red filtrate formed in the preparation of the 

 triamidotrinitrobenzol, because in spite of its marked color the amount 

 of solid dissolved in it is far from large. It seems, however, to con- 

 tain at least two compounds, one crystallizing in red needles, frequently 

 grouped in round masses like chestnut burs, the other a yellow sub- 

 stance forming flat crystals ; but the separation of these two bodies is 

 a matter of such great difficulty that we have not yet succeeded in 

 obtaining either of them m a state of purity, nor are we certain that 

 these are the only secondary products of the reaction. 



Trianilidotrinitrobenzol, C 6 (NHC 6 H 5 ) 3 (N0 2 ) 8 . 



This substance was prepared by allowing a mixture of tribromtrini- 

 trobenzol and aniline, in the proportion of one molecule of the former 

 to six of the base, to stand at ordinary temperatures, when the re- 

 action runs slowly, but is complete after the mixture has stood for a 

 day or two. The product was purified by washing with water, to 

 which a little hydrochloric acid was added to remove any slight excess 

 of free aniline, and crystallizing the residue from a mixture of alcohol 

 and chloroform. It was dried at. 100°, and analyzed with the following 

 results. 



I. 0.1468 grm. of the substance gave on combustion 0.3176 grm. 



of carbonic dioxide and 0.0516 grm. of water. 

 II. 0.1830 grm. of the substance gave 28.1 c.c. of nitrogen at 25° 

 temperature and 755 mm. pressure. 



Found. 



II. 



17.02 



If an excess of aniline is used in the preparation, and the mixture 

 heated, a coloring matter is formed looking like rosaniline ; but the 

 vol. xxni. (n. s. xv.) 10 



