OF ARTS AND SCIENCES. 379 



The constitution of the trichlortrinitrobenzol, since it is made from 

 the symmetrical trichlorbenzol, is also symmetrical, — 



CI : NO2 : CI : NO2 : CI : NO^ = 1 : 2 : 3 : 4 : 5 : 6. 



The description of the tribromtrinitrobenzol, as well as of some of 

 the derivatives of this very reactive substance, will be postponed until 

 another paper. 



