108 



Scientific Proceedings, Royal Dublin Society. 



metal bead was observed in the case of chromium, and to some 

 extent in that of aluminium. 



No experiments were made on manganese in this series. 



The number of experiments made with diflBcultly reducible 

 oxides in this series was very large, but as the results obtained 

 were of a negative character, we have not considered it necessary 

 to give the details of the individual experiments. 



SECOND SERIES OF EXPERIMENTS. 



Another series of experiments was now made differing from 

 the preceding ones in this respect. In all cases the substance and 

 fluxes were fused together in a shallow cavity in charcoal, the 

 oxidizing flame being employed, the beads on cooling were trans- 

 ferred to a cavity of the usual shape and size, metallic silver added 

 in the form of a button, and the whole heated in the reducing 

 flame. 



Easily Reducible Metallic Oxides. 



