106 



Scientific Proceedings, Royal Dublin Society. 

 Easily Eeducible Metallic Oxides. 



Metal. 



Quantities of Fluxes and 

 Substance. 



Reduction. 



Remarks. 



6. Bismuth, 



7. Copper, 



8. Nickel, . 



9. Zinc, 



Bismuth nitrate 

 crystals. 



Bicarbonate of soda, 



Borax, .... 



Silver chloride, 



Copper sulphate ) . 



crystals, j 



Bicarbonate of soda. 



Borax, .... 



Silver chloride, 



Deci- 

 grams, 

 1 



2 

 6 



Centi- 

 grams 



Nickel chloride, . 5 



Borax, . . . . 15 



Metallic arsenic, . 15 



Silver chloride, . 10 



Deci- 

 grams. 



Zinc sulphate, . . 3 

 Bicarbonate of soda, 3 

 Borax, .... 6 

 Metallic arsenic, . 1-5 

 Silver chloride, 12 



Complete. 



Complete. 



Complete. 



Incomplete. 



Metallic bead was very easily 

 fusible. On testing the borax 

 bead, no bismuth was found. 



This fusion was gradually 

 heated. The assay was cooled in 

 coal-gas ; the glass bead obtained 

 was clear and transparent. The 

 borax bead was tested for copper, 

 but none was found. Experi- 

 ments were tried, in which vary- 

 ing quantities of litharge were 

 used instead of silver chloride, 

 but the reduction was in all such 

 cases incomplete. 



With these small quantities the 

 fusion went very well, both 

 beads being sufficiently fusible. 

 On testing the borax bead for 

 nickel, none was found present. 



With larger quantities the re- 

 sults were not'satisfactory. Other 

 experiments were made without 

 the use of arsenic, but in all cases 

 the greatest difficulty was ex- 

 perienced in getting a fusible 

 bead, even when the proportion 

 of silver chloride to nickel chloride 

 was 1 to 40. Litharge was tried 

 instead of silver chloride, but 

 though a fusible bead resulted, 

 the fusion was not a success. 



Both beads were very easily 

 fusible. The metallic bead tailed 

 like impure mercury, and was 

 more fusible than the glass bead. 

 The amount of arsenic volatilized 

 was inconsiderable. The assay 

 was cooled in coal-gas. On test- 

 ing, zinc was found in both beads. 

 Other experiments were made 

 without the use of arsenic, but 

 the metallic bead ■was inf usihle in 

 all cases except where litharge 

 was employed. In some experi- 

 ments, silica was added to the 

 charge, but without good result. 



Note. — The experiments tabulated above are those which we regard as having 

 given the most satisfactory results in each case. 



