OF ARTS AND SCIENCES. 257 



up even at ordinary temperatures with great rapidity, whereas 

 heating to 100° is necessary to drive out the last traces. On this 

 account its presence has only a slight effect on the melting point, 

 lowering it hy a variable amount not exceeding 3° or 4°. Stand- 

 ing with alcohol if the crystals are small, or grinding them with 

 it if they are large, also drives out the chloroform, leaving the 

 usual orange prismatic form, and the same effect is produced hy 

 one crystallization from alcohol. Its action with other solvents 

 was not studied. 



Triparatoluidinitrobenzol, C 6 H(C 7 H 7 lSrH)3(N0 2 )2. — 10 grams of 

 tribromdinitrobenzol were heated with 18 grams of paratoluidine 

 on the steam bath for eighteen or more hours; the reddish black 

 product was freed from the excess of toluidine by standing with 

 dilute hydrochloric acid, followed by careful washing with hot 

 water, and then purified by crystallization from benzol and chloro- 

 form. The substance thus obtained was not, however, triparato- 

 luidodinitrobenzol, but its addition compound with chloroform, as 

 was shown by the isocyanide reaction, and the following analysis 

 of the crystals dried by pressing between filter paper. 



0.9079 gr. of the substance lost at 100° 0.1798 gr. of chlo- 

 roform. 



Calculated for 

 C 6 H(C 7 H 7 NH) 3 (N0 2 ) 2 CHC1 3 . Found. 



Chloroform 19.83 19.81 



Properties of Addition Compound C 6 H(C 7 H 7 NH) 3 (N0 2 ) 2 CHCl3. 

 — This substance crystallizes in long plates terminated at each 

 end by two planes at a rather sharp angle to each other. It has 

 a dark brownish red color and loses part of its chloroform even 

 at ordinary temperatures, but does not seem to be decomposed by 

 alcohol so easily as the corresponding anilido compound. 



In order to obtain the triparatoluidodinitrobenzol the preceding 

 compound was dried at 100° until all the chloroform had passed off, 

 and then crystallized from alcohol with a little benzol until it 

 showed the constant melting point 197°, when it was analyzed 

 with the following results : — 



I. 0.1907 gr. of the substance gave on combustion 0.4707 gr. 



of carbonic dioxide and 0.1039 gr. of water. 

 II. 0.2580 gr. of the substance gave on combustion 0.6351 gr. of 



carbonic dioxide and 0.1299 gr. of water. 

 vol. xxvn. (n. s. xix ) 17 



