THE DOCTRINE OF ENERGY 121 



of both, but which proves, with all the cogency of 

 Science, how it is that the Sensible is permeated by 

 and made knowable only by the Ideal, by the laws 

 of the transmutations which constitute actuality, 

 and that, on the other hand, the Ideal only enters 

 experience as the regulative principle of the ever- 

 transmuting Reality. 



The world consists not merely of phenomena, 

 nor of phenomena and laws which regulate them. 

 These are but transitional and imperfect aspects 

 of Reality. " Our standard of Truth and Reality," 

 says a recent writer, "moves us on towards an 

 individual with laws of its own, and to laws which 

 form the vital substance of a single existence." 

 We approach such a goal in the conception of 

 Energy the laws of whose constant transmutations 

 are what we call Nature. 



We must distinguish Energy as Absolute Reality 

 from such conceptions as Activity, which is its 

 subjective aspect, or as Force, which is really the 

 rate at which Energy is, in certain cases, trans- 

 formed. Dynamics, which investigates Force, is 

 a study of the fundamental transmutations of 

 Energy. It postulates Energy as the Real Entity 

 in terms of which it can frame a satisfactory theory 

 of dynamical phenomena. 



The metaphysical labours of the century which 



