JACKSON AND CALVERT. METAPHENYLENE DIAMINE. 157 



Properties of Tetrahromphenylene Diamine. It crystallizes in very 

 small white needles, which melt at 212°-213°, and are freely soluble 

 in benzol, chloroform, ether, acetone, or carbonic disulphide ; slightly 

 soluble in cold alcohol, freely iu hot ; almost insoluble in cold ligroine, 

 slightly soluble iu hot. The best solvent for it is a mixture of chloro- 

 form or benzol with ligroine. The tetrabromphenyleue diamine has 

 nearly, if not quite, lost the basic properties of a diamine, as was to 

 be expected since it is loaded with so many negative bromine atoms. 

 Hydrobromic acid had but little apparent action on it, even when hot, 

 although the liquid deposited after long standing a few transparent 

 crystals, which may have been the bromide. 



