IDENTICAL CHANGES 



current would pass quicker both going and coming, 

 would not leave that needle at right angles to that 

 current. 



PROPOSITION XIX. 



The dual nature of electricity is not a result of 

 two different occult powers. 



Electricity, while a manifestation of the one 

 universal force, is yet a distinctly separate, iden- 

 tical manifestation. Light, heat, magnetism and 

 visible mechanical motion can each be made to 

 produce electricity, and electricity can be made 

 to produce each of these in turn. 



Gravity alone has not been turned into elec- 

 tricity, neither can all the electricity of our age 

 detract from or add one grain to the weight of any 

 substance. 



There is not, in any manifestation of electricity, 

 a strict relation between the intensity of the per- 

 ceptible force and the Mass exhibiting it, and, 

 therefore, the whole Mass does not necessarily al- 

 ways participate in the Phenomena. And we can- 

 not accurately measure the Mass of a substance by 

 means of electricity alone. The units of electrical 

 measurements are at last based upon gravity, upon 

 the movement of Mass in time and distance. 



Except in electrical attraction electricity is not 

 recognized as being subject to the laws of increase 

 after the square by reduction of distance, and, 

 179 



