258 PROCEEDINGS OF THE AMERICAN ACADEMY 



tallization from hot benzol. Its composition was determined by the 

 following analyses : — 



I. 0.1569 gr. of the substance gave by the method of Carius 0.1322 gr. 

 of argentic bromide. 

 II. 0.1153 gr. gave 0.0963 gr. of argentic bromide. 



Calculated for Found. 



(CjH4Br02)3CeH3. I. H. 



Bromine 35.56 35.85 35.55 



Properties. — It forms a white crystalline powder made up ormicro- 

 scopic diamond-shaped plates, which belong to the monoclinic system, to 

 judge from their behavior toward polarized light; melting-point, HO*^. 

 Freely soluble in benzol, ether, or chloroform, very slightly soluble in 

 alcohol, glacial acetic acid, or carbonic disulphide, and essentially in- 

 soluble in water or ligroine. Hot benzol is the best solvent for it. 



It is an important point in favor of our method, that this is a crys- 

 talline substance, whereas the product of the action of benzoylchloride 

 on pyrogallol was, according to Nachbaur,* resinous, and the difficul- 

 ties in the way of its purification were so great that its formula could 

 not be determined with certainty. 



Parahrombenzamide, CgH^BrCONHg. — This substance was pre- 

 pared, as a contribution to our knowledge of the derivatives of para- 

 brombenzoic acid, by the action of strong amnionic hydrate on the 

 parabrombenzoylchloride. The white curdy precipitate thus obtained 

 was purified by three recrystallizations from boiling water. Its com- 

 position was determined by the following analyses : — 



I. 0.3012 gr. of the substance gave 18.6 c.c. of nitrogen gas under a 

 pressure of 767 mm. and a temperature of 18°. 

 II. 0.1326 gr. of substance gave by the method of Carius 0.1260 gr. 

 of argentic bromide. 



Calculated for Found. 



CeH^BrCONHj. I. IL 



Nitrogen 7.00 7.20 



Bromine 40.00 . . . 40.44 



Properties. — It forms small white rectangular plates with a pearly 

 lustre ; melting point, 186°. It is insoluble, or nearly so, in cold water, 

 soluble in hot, and in alcohol, ether, or glacial acetic acid, very slightly 

 soluble in chloroform, and essentially insoluble in ligroine, benzol, or 

 carbonic disulphide. 



* Wien. Acad. Ber., xxiv. 270. 



