Dissociation and Electrical Conductivity. 449 
temperature had been constant for 5 min., observations of the 
current were begun and were kept up for about three hours. 
The result is shown in fig. 8. 
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TLEME TE 
When the current had thus been reduced to 8 per 3 min., 
no recovery was found to have taken place after standing for 
fifteen hours, neither did the addition of moisture cause any 
alteration. A further amount of iodine was added without 
effect on the leak when the inner electrode was negative, but 
caused a slightly increased leak when the field was in the 
opposite direction. After heating for some hours the leak 
after addition of we: was, with a positive charge C, 
equal to 10 per $ min., with negative charge 4 per $ min. 
The same weight of mixture freshly heated gave 10 per 
4 min. with a positive charge. Prolonged heating had 
therefore no effect on the number of negative ions produced. 
Phil. Mag. S. 6. Vol. 8. No. 46. Oct. 1904. 21 
