OF ARTS AND SCIENCES. 371 



Kurbatow,* at 63°. 5. To confirm this indication we treated a por- 

 tion of the substance with fiuniug nitric acid at a temperature of 

 about 50°, when, instead of getting the trichlormononitrobenzol of 

 Eeilstein and Kurbatow,t melting at 68°, we obtained a substance 

 crystallizing in long, thick prisms, and melting at 130°. This obser- 

 vation made it necessary for us to study the action of fuming nitric 

 acid on symmetrical trichlorbenzol, the results of which research are 

 described fully in the following paper. It is sufficient to state here, 

 that we found the nitric acid used by us, even when acting in the cold, 

 converted the symmetrical trichlorbenzol into the trichlordinitrobenzol, 

 melting at 129°. 5, thus proving that the trichlorbenzol derived from 

 benzoltrisulphochloride is the symmetrical compound (1, 3, 5), and 

 confirming the result obtained by the first method. 



The study of the action of reducing agents on the benzoltrisulpho- 

 chloride will be described in a subsequent paper, and Mi-. G. T. Harts- 

 horn has undertaken the extension of this method of making sulpho 

 acids to other organic substances, obtaining results which will soon be 

 ready for publication. 



* Ann. Chem., cxcii. 233. t Ber. d. ch. G., 1877, p. 271. 



