OF ARTS AND SCIENCES. 321 



some tribromdinitrophenol. Upon boiling it with an aqueous solu- 

 tion of potassic carbonate, and allowing the solution to cool, small 

 orange needles were obtained, which on acidification yielded the 

 tribromdinitrophenol reoognized by its crystalline form and melt- 

 ing point. The highly colored filtrate from these crystals was now 

 treated with dilute sulphuric acid, extracted with ether, and the 

 extract crystallized from water by slow evaporation, when the char- 

 acteristic hexagonal prisms of trinitrophloroglucine were obtained. 

 As they showed a somewhat low melting point, 163-164°, instead 

 of 167°, (see the preceding paper,) the original substance and its 

 barium salt were analyzed with the following results : — 



0.2130 gr. of the substance gave 30.3 c.c. of nitrogen at a tem- 

 perature of 19°. 5 and a pressure of 776.1 mm. 



Calculated for 



C 6 (OH) 3 (N0 2 ) 3 Found. 



Nitrogen 16.09 16.67 



0.7080 gr. of the barium salt gave 0.5409 gr. of baric sulphate. 



Calculated for 

 [C 6 3 (N T 0„) 3 ],Ba 3 . Found. 



Barium 44.33 44.91 



The barium salt contained no water of crystallization. These 

 analyses leave no doubt that the substance is trinitrophloroglucine, 

 and the behavior of tribromtrinitrobenzol with water is therefore 

 represented by the following reactions : — 



C G Br 3 (N0 2 ) 3 + 3 H 2 = C 6 (OH) 3 (N0 2 ) 3 + 3 HBr. 

 C 6 Br 3 (X0 2 ) 3 + H 2 = C 6 Br 3 (N0 2 ) 2 OH + HX0 2 . 



The action of sodic hydrate and water upon tribromtrinitrobenzol 

 was similar to that of sodic carbonate and water, the products being 

 trinitrophloroglucine and tribromdinitrophenol. The action in this 

 case takes place somewhat more quickly than with the carbonate, 

 but we preferred to use sodic carbonate in order to avoid the ac- 

 tion of the boiling hydrate upon the glass of the flask. In the cold, 

 sodic hydrate seemed to have no action on tribromtrinitrobenzol, 

 which surprised us because Lobry de Bruyn * has found that it 

 acts in the cold on the unsymmetrical trinitrobenzol. 



* Rec. Trav. Chem., IX. 193. 

 vol. xxvn. (n. s. xix.) 21 



