444 Mr. Garrett and Dr. Willows: Chemical 
greatly diminished, the proportion depending upon the tem- 
perature, The following is a typical set of readings :— 
C charged to +200 volts. 
Leak with ZnCl, at different Temperatures. 
ia 
Leak. Temp. || Leak. Temp. 
pt BS oe eee [CR 
+ 20 | 21 J44 
4 150 | 36 348 
4 300 60 301 
4 320 106 B04 
a) 330 148 356 
12 338 
Fig. 4 
240 
180 
4/20 
bo 
LEAK 
310 330 350 370 
Fig. 4 is plotted from these readings. It shows that the 
conduction starts at a much higher temperature in this case 
than in the previous one; 246° in the one and about 322° in 
the other. It also throws jight on the rapid increase in con- 
duction shown in fig. 3 after temperature 320° is passed. 
At this temperature a new source of ionization appears which 
produces negative as well as positive ions. 
Fig. 5 gives the relation between the logarithms of the 
