86 PROCEEDINGS OP THE AMERICAN ACADEMY. 



tions of the amount of copper present in the large deep bkie crystals 

 showed respectively 29.41 and 29.32 per cent, the theoretical being 

 29.48. The ammonia was found to be 15.68, instead of the theoretical 

 amount 15.82 per cent, corresponding to the formula Cu(NHo)2C2H302. 

 The crystallized salt containing two and a half molecules of crystal 

 water, also discovered by Foerster, was prepared in blue feathery 

 crystals by the evaporation of aqueous ammoniacal cupric acetate. 

 Analysis showed the percentage of copper present to be 24.23 instead 

 of 24.38, and the ammonia to be 13.02 instead of 13.08 per cent. 

 The theoretical values were calculated for the formula 



CU(NH3)2(C2H302)2 . 2i H2O. 



All of these compounds, as well as many similar ones obtained from 

 other acids and the substituted ammonias, will be further studied at 

 this Laboratory in the near future. 



