374 Mr. E. Wilson. 



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kept down permanently as in the ordinary way. When observing 

 the deflections for the curve in fig. 1, the five cells used for exciting 

 had placed across their terminals a condenser of 4 microfarads 

 capacity. 



We are dealing with a very steep curve in these experiments, that 

 is to say, the rising portion for the large forces is very nearly per- 

 pendicular. We observe that it is on the steep portions that these 

 effects have been noticed, and such effects could very easily be pro- 

 duced by a slow change in the magnetising force. Such slow change 

 might arise from the heating of resistances in the circuit if these be 

 of carbon ; this was looked into and only metal resistances used. 

 The self-induction of the circuit might, if large enough, delay the 

 magnetising current and produce the effect. We have seen that it 

 is practically the same whether the applied potential be that due to 

 ten or fifty-six cells. In any case the self-induction can be approxi- 



