92 PEOCEEDINGS OF THE AMERICAN ACADEMY. 



Analysis of Cu8(C6Tl7N)i6Bri3(C2H302)3. 



I. 0.1754 gram of the substance yielded 0.0278 gram of copper. 

 II. 0.1754 gram of the substance yielded 0.1318 gram of argentic 

 bromide. 



III. 0.2445 gram of the substance yielded 0.1865 gram of argentic 



bromide. 



IV. 0.2200 gram of the substance yielded 0.1677 gram of argentic 



bromide. 



Calculated for Found. 



CU8(C6U,N),cBr3(C2U302)3. I. II. III. IV. 



Copper 15.82 15.85 



Bromine 32.30 32.00 32.46 32.44 



(5.) DiCUPRIANILINE ACETOMONOBROMIDE, 



This substance is formed with comparative ease, and was often ob- 

 tained in the unsuccessful attempts to prepare cuprianiline acetobromide 

 (No. 2). Its preparation is more certain if somewhat less cupric bro- 

 mide — two grams instead of three — is used in the mixture described 

 under that head. This variation of desirable conditions was to have 

 been expected. Dicuprianiline acetomonobromide may also be formed 

 bv addint^ acetic acid to an alcoholic solution of cupric bromide until 

 the color of the solution has become green, and then addiug the aniline 

 as before. After several hours, in either case, the compound separates 

 as a dark bluish-black powder, insoluble in alcohol and glacial acetic 

 acid. It is not decomposed by water, and boiling concentrated potassic 

 hydrate will only remove a very small part of the bromine. At a 

 moderate heat it is surprisingly stable ; but upon ignition it is decom- 

 posed with considerable violence. When brought in contact with a 

 drop of hot concentrated nitric acid it is almost explosive in the energy 

 of its decomposition. 



Analysis of Cu2(C6H,N)4(C2HA).iBr. 



I. 0.1849 gram of the substance yielded 0.0310 gram of copper 

 upon electrolysis. 

 II. 0.2310 gram of the substance yielded 0.0560 gram of argentic 

 bromide. 



III. 0.2053 gram of the substance yielded 0.0515 gram of argentic 



bromide. 



IV. 0.1168 gram of the substance yielded 0.2026 gram of carbon 



dioxide upon combustion. 



