138 PROCEEDINGS OF THE AMERICAN ACADEMY. 



The number of cuprammouium compounds, including the two classes 

 cupron- and cM/>n-ammonium, seems to be almost unlimited. When a 

 large amount of data has been accumulated, we shall be in a better posi- 

 tion than we are at present to determiue the constitution of these inter- 

 esting bodies, and to explain their analogy to salts containing crystal 

 water on the one hand, and their relations to the stable cobaltamine 

 compounds on the other. For the present, the best that can be done is 

 to multiply the available experimental evidence regarding them. 



Cambridge, Mass., June, 1897. 



