172 THE PROBLEM OF EVOLUTION 



acts as an accumulation of psychological energy 

 which cannot be distinguished from all other forms 

 of energy. Thus our mental energy is only the 

 transformation of the general energy which fills 

 the universe.' 



Answer to No. 7. Juliusburger is wrong in 

 asserting that the relation between body and 

 soul is intelligible only in the light of the mon- 

 istic theory of identity or of that of the monistic 

 theory of transformation. For (a) besides these 

 two theories there is at least one other, viz. that of 

 the essential difference between the soul and body 

 of man, of their connection to form one whole, 

 and of their reciprocal action upon each other. 

 This is precisely the dualistic theory, which 

 Juliusburger did not succeed in overthrowing 

 in the previous six points of his discourse, and 

 which therefore I still maintain to be true. 



(b) The theory of identity, to which he referred, 

 ought not to be known by the name of Forel, 

 but by that of Fechner, who first evolved it. 

 It is what has been called * the stupid two-sided 

 theory,' which designates as 'mind' the inner 

 side of the brain, and as ' brain ' the outer 

 side of the mind, thus affording no scientific 

 explanation at all. Cf. on this subject C. 

 Stumpf, Leib und Seele (Body and Soul), 

 Opening Address at the International Psycho- 

 logical Congress in 1896, printed at Leipzig 



