452 Dr. Beattie on Leakage of Electricity from 



another experiment the respective leaks were 6*5 and 4 volts 

 per minute. 



With salt spread over the zinc strips the leak was the same 

 as in the case of zinc alone ; in the instance last mentioned, 

 6 volts and 4 volts per minute. 



Finally, when iodine was sprinkled on the common salt — 

 flame on continuously — the following results were obtained: — 



+ 190 volts : 



+ 132 volts after J minute ; 



+ 58 volts lost in \ minute. 



-200 volts: 



— 195 volts after 1 minute ; 



— 5 volts lost in 1 minute. 



Zinc strips with iodined common salt were now placed on 

 the bottom of a zinc box which was connected to case of 

 instrument and iron plates insulated inside the box. 



— 206 volts negative : 



154 volts after 1 minute ; —52 volts per minute. 



+ 183*5 volts positive : 



181 volts after 1 minute ; +2| volts per minute. 



§ 13. Experiments were made to determine how long the 

 peculiarities as regards electric discharge lasted. 



In several instances, after a comparatively short period of 

 heating the effect ceased. This was the case with potassium 

 chloride and bromine, with potassium permanganate, with 

 potassium chlorate and iodine, with potassium chlorate and 

 manganese dioxide. 



In the case of salt sprinkled with iodine insulated on zinc 

 strips the effect lasts longer. In one case the strips covered 

 with this iodined salt were heated till the effect was shown, 

 and then laid aside. The same strips were heated again at 

 the end of a week, with a similar result. Ten days later 

 it was again found to act. Sixteen days later the effect was 

 still shown on heating ; on this latter occasion, however, after 

 heating for over an hour the peculiar property was lost. 



A new supply of salt was then taken, sprinkled with iodine, 

 and heated steadily; it was found that after three or four 

 hours' heating the increased leak ceased. When more iodine 

 was added the increased leak was again observed on heating. 

 This experiment was repeated several times with the same 

 result. 



With potassium bichromate and bromine sprinkled on it 

 and placed on zinc strips, it was found that the increased 

 leak ceased after heating for about two hours. 



