— 
W.. Crookes Radiant Matter. 257 
not produce. any movement. I now put a magnet, g, over the 
tube, so as to deflect the stream over or under the obstacle ¢ d, 
magnet. 
I have mentioned that the molecules of the Radiant Matter 
discharged from the negative pole are negatively electrified. 
It is probable that their velocity is owing to the mutual repul- 
sion between the similarly electrified pole and the molecules. 
In less high vacua, such as you saw a few minutes ago, the 
discharge passes from one pole to another, carrying an electric 
current, as if it were a flexible wire. Now it is of great inter- 
est to ascertain if the stream of Radiant Matter from the nega- 
tive pole also carries a current. Here (fig. 18) is an apparatus 
which will decide the question at once. The tube contains 
two negative terminals (a,'b) close together at one end, om one 
positive terminal (c) at the other. This enables me to sen two 
streams of Radiant Matter side by side along the hosphores- 
cent screen,—or by disconnecting one negative pote, only one 
stream. 
If the streams of Radiant Matter carry an electric current 
they will act like two parallel conducting wires and attract one 
Am. Jour. Sct,—Turep Szrtes, VoL. XVIII, No. 106,—Ocrt., 1879. 
17 
