OF ARTS AND SCIENCES. 259 



avoid the formation of purple dye stuff. The product was treated 

 with dilute hydrochloric acid twice, allowing the mixture to stand 

 for some time, and then washed thoroughly with water, after which 

 it was purified hy crystallization from benzol and alcohol, or chloro- 

 form and alcohol, until it showed the constant melting point 243°, 

 when it was analyzed with the following result : — 



0.2691 gr. of the substance gave 34 c. c. of nitrogen at a tem- 

 perature of 23° and a pressure of 763.3 mm. 



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



Nitrogen 14.49 14.31 



Properties. — The substance crystallizes in rather stout pointed 

 needles of a full red color, which melt at 243°, and are somewhat 

 soluble in hot ethyl or methyl alcohol, less soluble in either cold; 

 freely soluble in chloroform, acetone, or hot benzol, not very soluble 

 in cold benzol; slightly soluble in hot ligroine. Sodic hydrate had 

 no apparent action on it. An attempt to make a chloroform com- 

 pound from it led to no result, the substance crystallized from chlo- 

 roform showing no loss when heated to 120°. Nor have we suc- 

 ceeded in finding a yellow modification, although we have tried the 

 methods which yielded such modifications with the corresponding 

 compounds of aniline and paratoluidine ; we think further experi- 

 ments of this sort necessary, however, before we can be certain that 

 such a modification does not exist. The high melting point and 

 the observations just mentioned indicate that this ortho compound 

 is decidedly different from the corresponding para compound. 



