Mr. W. Crookes. 



[June 11, 



during the continuance of the experiment. A deposit around the 

 negative pole took place almost immediately, and in five minutes the 

 bulb surrounding it was opaque with deposited metal. The positive 

 pole with its surrounding luminosity could be easily seen the whole 

 time. In thirty minutes the experiment was stopped, and after all 

 was cold the tube was opened and the wires weighed again. The 



results were as follows : 



Positive pole. 



Original weight of cadmium 9'34 grs. 



Weight after experiment 9'25 



Cadmium volatilised in 30 mins. . . 0'09 ,, 



Finding that cadmium volatilised so readily under the action of 

 the induction current, a large quantity, about 350 grs., of the pure 

 metal, was sealed up in a tube arranged as in fig. 8, and the end of 



Negative pole. 

 9-38 grs. 

 1-86 . 



FIG. 8. 



the tube containing the metal was heated to a little above the melting 

 point ; the molten metal being made the negative pole, in a few hours 

 the whole quantity had volatilised and condensed in a thick layer on 

 the far end of the tube, near, but not touching, the positive pole. 

 Volatilisation of Silver. Silver was the next metal experimented 



