252 W. Crookes— Radiant Matter. 
aluminium cross to produce the shadow ; the glass has been 
hammered and bombarded till it is appreciably warm, and at 
the same time another effect has been produced on the glass— 
its sensibility has been deadened. The glass has got tired, if 
Matter. It is projected with great velocity from the negative 
pole, and not only strikes the glass in such a way as to cause 
it to vibrate and become temporarily luminous while the 
discharge is going on, but the molecules hammer away with 
oa energy to produce a permanent impression upon the 
Radiant Matter exerts strong mechanical action where it strikes. 
se have seen from the sharpness of the molecular shadows, 
at Radiant Matter is arrested by solid matter placed in its 
path. If this solid body is easily moved the impact of the 
molecules will reveal itself in strong mechanical action. Mr 
