50 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cooled and shaken continually during the addition of the acetanilid. The 

 solution thus obtained was poured into water, and the yellowish precipi- 

 tate crystallized from a mixture of acetone and alcohol until it showed 

 the constant melting-point 229°, when it was dried at 100°, and analyzed 

 with the followincr results : — 



I. 0.1485 gram of the substance gave 0.2009 gram of argentic bromide 



by the method of Carius. 

 II. 0.1624 gram of the substance gave 0.2194 gram of argentic bromide. 



Bromine 



Properties. — This tribromnitracetanilid crystallizes from alcohol and 

 acetone in white well formed crystals belonging either to the hexagonal 

 or orthorhombic system. When less well crystallized it forms long very 

 slender prisms terminated by a single plane at an oblique angle, or thick 

 clumps of curving needles. It melts at 229°; and is easily soluble in 

 acetone ; soluble in alcohol ; slightly soluble in benzol or ether ; essen- 

 tially msoluble in ligroin. Sulphuric acid saponifies it in time, but this 

 effect is produced much more easily by a strong solution of sodic hydrate. 



Tribromnitraniline, CeHBrgNOoNH., NHgl, Brg 3, 4, 5, NOo 2. 



This substance was obtained by boiling ten grams of tribromnitra- 

 cetanilid with a strong solution of sodic hydrate. As the tribromnitra- 

 cetanilid was saponified, the solution took on a deep reddish brown color. 

 When the reaction was complete, the solution was acidified with acetic 

 acid, which threw down a brownish precipitate. This was filtered out, 

 and recrystallized from alcohol and chloroform until it showed the con- 

 stant melting point 130°, when it was dried at 100°, and analyzed with 

 the following results : — 



I. 0.19 1 2 gram of the substance gave 0.2864 gram of argentic bromide 



by the method of Carius. 

 II. 0.2006 gi'am of the substance gave 0.3017 gram of argentic bromide. 

 III. 0.2624 gram of the substance gave 18.1 c.c. of nitrogen at a tem- 

 perature of 19°. 4 and a pressure of 761.2 mm. 



III. 



7.93 



