16 NOMOS. 



of the spirit lamp after the poles are separated. 

 The explanation is the same. 



What then? If there is no real difference be- 

 tween ordinary and voltaic electricity in any of these 

 respects, where is the difference, for difference there 

 assuredly is somewhere? Now the only difference 

 which can be found is in simple quantity, and this 

 is astonishingly great. 



Dr. Faraday's solution of this question, as of every 

 other question which he has undertaken to solve, is 

 most conclusive. In this solution the first 

 toencebe! lf ~ thing to be determined was whether the 

 same absolute quantity of ordinary elec- 

 tricity sent through a galvanometer under 



quantity, and different circumstances will cause the same 



not of kind. 



deflection of the needle. This was found 

 to be the case ; for, on turning the machine a certain 

 number of times, the needle was always deflected to 

 the same point, whether the charge was collected in 

 one Leyden jar or in several, and whatever the re- 

 tarding power of the medium through which the dis- 

 charge was effected. This point being determined, 

 the next step was to compare ordinary and voltaic 

 electricity, quantity by quantity, by means of the 

 deflection of the needle. 



In this comparison the machine used had two sets 

 of rubbers, and its plate was fifty inches in diameter. 

 The prime conductor consisted of two brass cylinders 

 connected by a third, the whole length being 12 

 feet, and the entire surface in contact with the air 

 about 1422 square inches. When in good working 



