60G 
Mr. S. Russ on Distribution in Electric Fields of 
graphically in fig. 3, where abscissae denote pressures and 
ordinates the corresponding activities. 
Table II. 
Positive Electrode. 
Negative 
Electrode. 
Pressure in cms. 
Activity. 
Pressure in cms. 
Activity, 
•13 
152 
•13 
780 
■27 
140 
204 
1360 
■oo 
163 
270 
722 
1400 
1540 
•63 
110 
3-78 
6-24 
148 
120 
94 
79 
7-80 
1470 
Xeutral Electrode. 
Pressure in cms. 
Activity. 
•06 
219 
7-30 
77 
•40 
198 
894 
77 
314 
374 
2^7 
300 
1096 
75 
8-44 
447 
8-82 
437 
It will be seen that whereas the activity of the cathode 
decreases with diminishing pressure, there is a very marked 
increase in the activity of the anode, while the amount of 
active deposit that diffuses on to the neutral rod decreases 
very considerably as the pressure is reduced. 
Diffusion experiments similar to those just cited are at 
present being made, in which, however, other metals than 
brass are used as containing-cylinder and rod. 
It will be seen from fig. 3 that at a pressure of about 
2 mms. the quantity of active deposit transmitted to the 
anode is approximately equal to that diffusing on to a neutral 
pole. 
Xow the active deposit that diffuses on to a neutral pole 
we have seen to be in the main positively charged (the bulk 
of it going to a cathode in an electric field). Very little of 
this positively charged matter can make its way to the anode. 
In order to account for the quantity obtained on the anode 
we are led to the conclusion that some at least of the active 
deposit particles that make their way to the anode are 
negatively charged. 
