SCIENCE AND REVOLUTION 



ulty is the labor-power of the human brain, the 

 latent energy of the protoplasmatic system of the 

 human body. The brain performs its function 

 by converting its latent energy into motion, or 

 thought, in response to all the stimuli sent to it 

 by way of the protoplasmatic system. This func- 

 tion is a labyrinth of objective reactions and 

 subjective counter-reactions. It is all this as a 

 part of the entire natural universe, and it is 

 nothing else. The difference between conscious 

 and unconscious, or subconscious, thought is 

 purely one of the intensity of stimuli and reac- 

 tion. And when physio-chemical biology will 

 have analyzed this labyrinth of processes, traced 

 its fundamental reactions in the laboratory, and 

 connected them with the final source of all, the 

 universe, man will know all that his faculty of 

 thought can find out about itself and other rid- 

 dles of the universe. 



This conception of the universe and of the 

 human soul is diametrically opposed to meta- 

 physical and theological dualism. Truly does 

 Haeckel cry out : " An honest and objective ob- 

 servation of these obvious antagonisms makes 

 their reconciliation impossible. Either an under- 

 standing of nature and experience, or the fables 

 of belief and revelation ! " 



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