Mr. W. Crookes. 

 FIG. 2. 



[June 11, 





ciently to allow many of the molecules to pass beyond the sphere of 

 attraction of the mass. When, however, the current was turned on, 

 the oscillations were increased sufficiently to carry some of the mole- 

 cules beyond their spheres of attraction and hence into the vacuous 

 space above. As in the water experiment, this only happens at the 

 negative pole. It would seem that, even after having been removed 

 from the rest of the mass, the on-rushing stream of gaseous molecules 

 is necessary to carry the metallic molecules away, and, as I shall pre- 

 sently show, even then they very quickly drop out of the ranks and 

 deposit on the walls of the tube. 



FIG-. 3. 



Another tube was made as shown in fig. 3. The poles A, B, C, D 

 were platinum wires sealed through the glass, A and D having 

 aluminium poles covering the platinum wire. In the ends of the 



