100 THE DOCTRINE OF ENERGY 



spending aspects of one outer world. The laws 

 which regulate the cerebral changes that accompany 

 sense-presentation are for me the necessary a priori 

 laws of perception. It is because these laws operate 

 in common in all brains that community of inter- 

 course is possible amongst mankind. It is because 

 of the further fact that the whole of the trans- 

 mutations of Energy which constitute physical 

 phenomena compose a numerically inter-related 

 and regulated system that Science and rational 

 knowledge are possible to the intellect of man. Our 

 knowledge is what we are obliged to think and 

 assert regarding experience ; but the universality 

 of experience is not explained merely by the 

 common nature and general laws of Intelligence, 

 but depends also on the generality of the laws 

 under which the transmutations of Energy pro- 

 ceed. 



We are now, therefore, by the aid of the doctrine 

 of Energy, better able than before to distinguish 

 accurately between the Ideal and the Real as 

 contrasted elements in our experience. 



My Presentment as a whole consists in the trans- 

 mutation-processes in the sensations, feelings, 

 perceptions, images, ideas in short, in all that is 

 going on at the point where (I necessarily express 

 myself in terms of spatial relations, though in this 



