AND TIIK RELATION OF SPECIFIC HEAT TO ATOMIC WEIGHT. 



239 



The density of the metal was found to be 8*8759 and 8'8776, or a mean of 8-8768 

 at 21/4. 



Pure Nickel. The same, fused. 



The density of the fused metal was slightly less than that of the unfused, namely, 

 87903 at 22/4. 



This specimen was afterwards found to contain a small quantity of sulphur. It 

 was therefore dissolved in nitric acid and converted into the double amrnonio- 

 sulphate, and this, after recrystallisation, was submitted to electrolysis, using an 

 anode composed of fused Mond nickel. Its specific heat was determined after fusion. 



Series XL 



The results not being so concordant as was desired, the metal was cut through, as 

 it was suspected there might be cavities, which would render the drying difficult. 

 No cavities were observable, but in the succeeding experiments the metal was dried 

 over sulphuric acid in an exhausted desiccator before use. 



