Metals under the Influence of Alpha Bays. 321 



plied to the case and the ordinates of Curves I and III are, 

 respectively, the currents observed with one foil, and with no 

 foils, interposed. The difference between the ordinates ©f the 

 two curves shows the effect of the assumed soft radiation. This 



Fig. 4. 



VOLTS 



effect is greatly diminished as higher positive potentials are 

 applied to the case, so that at 1000 volts it is reduced to about 

 one-fourth of its value at 40 volts. This indicates that the 

 radiation consists of electrons with much higher velocities 

 than those attributed to the 8-rays, and with a wide range of 



