78 PROCEEDINGS OF THE AMERICAN ACADEMY 



II. 0.1494 gr, of the substance gave 18.9 c. c. of nitrogen at a tem- 

 perature of 24°. 3 and a pressure of 752.3 mm. 



Calculated for Found. 



C6H(C6H6NH)cno,)3Cno3(co2C2Hb)j. I n. 



Carbon 44.97 44.88 



Hydrogen 3.35 4.88 



Kitrogen 13.80 14.02 



In spite of the unsatisfactory number for the hydrogen, these results 

 prove that the substance has the formula which we have assigned to 

 it. The yield was good, 0.9 gr. of the nitrite of the bromtriiiitrophe- 

 nylmalonic ester giving 0.7 gr. of the anilido compound, instead of the 

 0.92 gr. required by the theory, that is, 76 per cent. 



Properties. — The nitiite of the anilidotrinitrophenylraalonic ester 

 is a very beautiful substance, crystallizing in rhombohedra often two 

 millimeters long and one millimeter thick, with a very acute angle, 

 which is frequently, but not always, truncated by a basal plane. The 

 color of the crystals by reflected light is a rich full red, somewhat 

 darker than that of chromic anhydride, by transmitted light orange- 

 red. It melts at 119°, turning black and giving off a few bubbles of 

 gas, if the temperature has not risen above this point ; but at 120° it 

 decomposes with such violence that frequently a good part of the sub- 

 stance is thrown out of the capillary melting tube. It is essentially 

 insoluble in cold water, and its solubility does not seem to be uicreased 

 by heat; very slightly soluble in cold ethyl alcohol, more soluble in 

 hot, but still not freely, the hot solution seems to undergo partial de- 

 composition ; more soluble in methyl alcohol, whether cold or hot, 

 than in ethyl alcohol, but not freely even in this ; very freely soluble 

 in chloroform ; freely in benzol, or acetone ; soluble in glacial acetic 

 acid; slightly in ether, or carbonic disulphide; insoluble in ligroine. 

 The best solvent for it is a mixture of chloroform and alcohol. Strong 

 sulphuric acid seems not to act on it in the cold, but when heated 

 with it the substance decomposes, and then dissolves with a blackish 

 color ; strong nitric acid does not act on it in the cold, but when hot 

 dissolves it with a yellow color ; strong hydrochloric acid has no action 

 on it, whether cold or hot. 



The nitrite of anilidotrinitrophenylmalonic ester showed marked 

 acid properties. Acid sodic carbonate in aqueous solution had no 

 action with it, but, if assisted with alcoliol, gave a red solution ; potas- 

 sic carbonate behaved in the same way ; sodic hydrate turned the 

 crystals black, forming at the same time a brownish solution, which 

 on addition of alcohol became deeper and blackish red, turning in 



