528 ELECTKICAL CONDUCTIVITY OF FLAMES CONTAINING SALT VAPOURS. 
i Concentration of 
solution, sjijrayed. 
Current calculated. 
(1-) i (2.) 
1 
Current 
observed.* 
i 
0-2 
(31-9) 
(31-9) 
31-9 
OT 
22-6 
20-1 
21-0 
0-05 
15-9 
12-7 
14T 
0-01 
7-14 
4-33 
6-0 
It will be observed that in each case the observed current lies between the two 
calculated currents. 
The results of the observations described above on the fall of potential between the 
electrodes show that there is a very close analogy between the conductivity of salt 
va230urs in flames and the conductivity of gases at low pressures. In both cases there 
is a greater fall of potential near the negative electrode than near the jDositive 
electrode, with a small slope of potential in the intermediate space, and it seems very 
likely, therefore, that the j^eculiar form of the fall of potential in gases at low pressures 
is due, like that in the flame, to a great difference between the velocities of the 
jDositive and negative ions. 
In conclusion, I desire to exjiress my best thanks to Professor J. J. Thomson for 
many valuable suggestions during the course of these exj^eriments, and also to 
Professor A. Smithells for his kindness in allowing me to continue the investigation 
of this subject begun in his laboratory. 
* These numbers are taken from the previous paper on this subject. 
