182 PROCEEDINGS OP THE AMERICAN ACADEMY 



solution. After several precipitations from aqueous solutiou by alco- 

 hol, it was crystallized from water by evaporation, and dried by 

 exposure to the air. The salt could not be distinguislied in outward 

 appearance from that made from mucobromic acid. 



I. 2.4931 grm. of air-dried salt lost in weight, at 125-130°, 0.2136 

 grm. 0.7670 grm. of this dried salt gave, on ignition with 

 H^SO,, 0.4398 grm. BaSO^. 

 11. 0.5899 grm. air-dried salt gave 0.3102 grm. BaSO^. 



The solubility of this salt was determined according to the method of 

 v. Meyer. 



8.9481 grm. of a solution saturated at 20° gave 0.2912 grm. 

 BaSO,. 



The aqueous solution saturated at 20°, therefore, contains 5.71 per 

 cent of the anhydrous salt. 



From this barium salt, the free acid was made in the manner above 

 described. In its behavior towards solvents, it resembled perfectly the 

 acid made from mucobromic acid, and it melted between 120° and 

 123°. This acid I did not analyze; but the analyses published by 

 Kekule show too high a percentage of bromine, and in this respect do 

 not differ essentially from those 1 have given above. 



Calculated for C^H^BrjO^. Found by Kekule. 



I. II. 



Br. 58.38 58.98 59.08 



By heating this acid in a stream of carbonic dioxide, the anhydride 

 could readily be made in appearance and behavior perfectly identical 

 with the compound already described, and melting at 114°-115°. 



I. 0.4160 grm. substance gave 0.2860 gr. CO.. and 0.0032 grm. 

 11,0. 

 II. 0.2840 grm. substance gave 0.4165 grm. AgBr. 



Calculated for C^BrjOj. Found. 



I. U. 



C 18.75 18.75 



H — 0.10 



Br 62.50 62.34 



