82 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



substance, but the faces were so covered with striations that the result 

 was only partially satisfactory. For cupriammonium acetate the chief 

 prism angle was about 70°, while for the complicated salt under con- 

 sideration it was over 71° 30'. Even allowing a considerable margin 

 for possible error, it would appear that the complicated salt must be a 

 definite compound, and not merely cupriammonium acetate containing 

 occluded cupric acetate and ammonic iodide. Another evidence of the 

 probable definiteness of the salt is to be found in the fact that Richards 

 and Moulton, in a paper yet to be published, have proof of the exist- 

 ence of a similar compound containing aniline and bromine instead of 

 ammonia and iodine. The compound has no unexpected properties, 

 and was analyzed in the usual fiishion. 



Analysis of Cu8(NH3)i6l(C2H30,),5. 



I. 0.2545 gram of the substance distilled with potash required 

 22.68 cubic centimeters of decinormal acid, gave 0.0333 gram 

 of argentic iodide, and on electrolysis yielded 0.0707 gi-am of 

 copper. 

 II. 0.2120 gram of the substance required 18.52 cubic centimeters 

 of decinormal acid. 

 III. 0.2419 gram of another sample of the substance required 21.23 

 cubic centimeters of acid, and gave 0.0331 gram of argentic 

 iodide and 0.0G80 gram of copper. 



Copper 



Ammonia 



Iodine 



Acetic acid (by dif ) 



Calculated for 

 aboTe Formula. 



28.35 



15.22 



7.07 



49.36 



100.00 



Found. 



27.95 



15.05 



7.23 



49.77 



100.00 



