12 



On Radiant Matter. 



Radiant Matter proceeds in straight lines. 



The Radiant Matter whose impact on the glass causes an 

 evolution of light, absolutely refuses to turn a corner. 

 Here is a V-shaped tube (Fig. 6), a pole being at each ex- 

 tremity. The pole at the right side (a) being negative, you 



FIG. 6. 



see that the whole of the right arm is flooded with green 

 light, but at the bottom it stops sharply and will not turn 

 the corner to get into the left side. When I reverse the 

 current and make the left pole negative, the green changes 

 to the left side, always following the negative pole and 

 leaving the positive side with scarcely any luminosity. 



In the ordinary phenomena exhibited by vacuum 

 tubes phenomena with which we are all familiar it is 

 customary, in order to bring out the striking contrasts 

 of colour, to bend the tubes into very elaborate designs. 

 The luminosity caused by the phosphorescence of the 

 residual gas follows all the convolutions into which 

 skilful glass-blowers can manage to twist the glass. 

 The negative pole being at one end and the positive pole 



