232 PROCEEDINGS OF THE AMERICAN ACADEMY. 



of bromine had evaporated. The reddish oil which resulted soon 

 solidified and was recrystallized from alcohol until it showed the con- 

 stant melting point of 68°-69°, when it was dried in a desiccator and 

 analyzed. 



0.2222 gram of the substance gave, by the method of Carius, 0.3177 

 gram of argentic bromide. 



Bromine 



This body crystallizes beautifully in long pearly fibres, often col- 

 lected in bunches and sometimes branched, which melt at 68°-69° 

 and are practically insoluble in cold water; very soluble in benzol and 

 carbonic disulphide ; readily soluble in ligroin and chloroform ; quite 

 soluble in acetone, but less soluble in ether. Alcohol is the best sol- 

 vent for purification. 



This tribrom ether reacts but very slightly with sodic ethylate at the 

 boiling temperature of alcohol, and no more strikingly when boiled 

 with sodic amylate. When boiled with aniline, the tribrom ether gave 

 an amorphous black mass from which nothing definite could he ob- 

 tained. Inasmuch as the sodic ethylate had so little action on this 

 body, it was deemed unnecessary to carry this line of work farther, 

 for the reasons given under the dibrom compound. 



Constitution of Tribromresorcine Diethylether. 



Tribromresorcine diethylether dissolves readily in fuming nitric acid, 

 giving the body C 6 Br 3 N0 2 (OC 2 H 5 ) 2 , as was proved by its melting 

 point, 100°-10l°. As one of us and Warren # prepared this substance 

 from symmetrical tribromtrinitrobenzol, this experiment proves the 

 symmetrical position of the three bromine atoms in tribromresorcine 

 diethylether. 



Dinitroresorcine Diethylether, C 6 H 2 (N0 2 ) 2 (OC 2 H 5 ) 2 . 



When dibromresorcine diethylether is treated with fuming nitric 

 acid, the result is different from that obtained with the corresponding 

 tribrom compound. To study this action, some of the dibrom ether 

 was added to an excess of fuming nitric acid, when it immediately 

 dissolved, after which it was treated with excess of water and the 

 reddish oil which separated allowed to solidify. It was then recrys- 



* These Proceedings, XXV. 183. 



