OF ARTS AND SCIENCES. 179 



n. 



62.61 



The aqueous solution obtained by treating the original product 

 from the action of bromine with cold water, therefore, contained mainly 

 an acid of the composition of dibrommaleic acid. 



In the mother liquors from the baric dibrommaleate there appeared 

 to be a trace of a more soluble barium salt beside baric bromide ; 

 but its quantity was too small to admit of separation and analysis. 



The oily residue left undissolved by water gradually solidified upon 

 standing. Cold chloroform dissolved the greater portion of It, leav- 

 ing a small quantity of short, prismatic crystals. Upon evaporation 

 of the chloroform, an oil was left, which gradually solidified in masses 

 of radiated prisms, contaminated with a small quantity of au oily 

 impurity whose nature could not further be determined. After sev- 

 eral crystallizations from alcohol, this substance melted at 55-56°, 

 and v/hen treated with baric hydrate gave the characteristic reactions 

 of mucobromylbromide. It was still further identified by analysis. 



0.2280 grm. substance gave 4000 grm. AgBr. 



Calculated for CiUBrjOj. Found. 



Br 74.77 74.68 



The prismatic crystals, which were sparingly soluble in cold water 

 and chloroform, were recrystallized from hot water, and showed then 

 the characteristic properties of ordinary dibromsuccinic acid. On heat- 

 ing, they remained unaltered till the temperature had risen to over 

 200° ; at a somewhat higher point, they had completely volatilized. 

 The sublimate condensed in the colder portions of the tube in oil 

 drops, which gradually solidified. The melting point of the solid thus 

 obtained, after pressing with filter paper, was found to be 126°. 

 According to Fittig and Petri, f the sublimate formed under the same 

 conditions from dibromsuccinic acid has the melting point of mono- 

 brommaleic acid (128°). The quantity of dibromsuccinic acid formed 

 in this reaction was quite small. 



0.2855 grm. substance gave 0.3880 grm. AgBr. 



Calculated for C4ll4Br204. Found. 



57.97 57.83 



t Ann. Chem. u. Pharm., cxcv. 68. 



