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PROCEEDINGS OF THE AMERICAN ACADEMY 



It is evident that we are dealing here with a phenomenon similar 

 both qualitatively and quantitatively to that observed in the case of 

 copper. Zincie oxide prepared from the nitrate occludes a very ap- 

 preciable quantity of nitrogen and a somewhat variable quantity of 

 oxygen. Continued application of heat tends to drive out both gases, 

 the oxygen being less firmly held than the nitrogen ; but the highest 

 heat which we were able to obtain was insufficient wholly to eliminate 

 either gas. Under like conditions, specimens of zincie oxide made 

 from zincie nitrate which had been obtained in a number of different 



