112 PROCEEDINGS OF THE AMERICAN ACADEMY 



III. 0.1815 gr. of the substance gave 26 c.c. of nitrogen at a tempera- 

 ture of 17° and a pressure of 743 mm. 



Calculated for Found. 



CoH(NHCeH5)3(N02)2. I. II. ni. 



Carbon 65.31 65.13 



Hydrogen 4.30 4.64 



Nitrogen 15.88 16.24 16.24 



Properties. — The trianilidodinitrobenzol, when crystallized from 

 alcohol, forms vivid orange-red needles, which under the microscope 

 appear as long prisms terminated by a single plane at angles not very 

 far from right angles to the sides, occasionally groups of radiating 

 needles are observed also. When crystallized from ether, it forms 

 irregularly spherical crowded groups of short stout radiating prisms 

 with blunt ends made up of several planes, a form which is decidedly 

 characteristic. It melts at 179°, and is essentially insoluble in either 

 cold or boiling water, or in ligroiue ; slightly soluble in cold alcohol, 

 freely in hot; moderately soluble in ether, carbonic disulphide, glacial 

 acetic acid, or acetone ; freely soluble in benzol, or chloroform, but 

 the substance is deposited from the two solvents last mentioned in an 

 amorphous form, so that hot alcohol is the best solvent for it. Strong 

 hydrochloric acid, either hot or cold, has no perceptible action on it. 

 Strong nitric acid dissolves a very little, with a pale yellow color ; 

 strong sulphuric acid dissolves rather more of the substance, with a 

 stronger yellow color. Upon heating it with either of these last two 

 acids it is charred. It is therefore, as was to be expected, less basic 

 in its properties than the triamidodinitrobenzol. 



