ON THE PSYCHO-PHYSICAL VIEW OF NATURE. 525 



special kind of unity which cannot be defined, a unity 

 which, even when apparently lost in the periods of un- 

 consciousness, is able to re-establish itself by the wonder- 

 ful and indefinable property called " memory " a centre 

 which can only be very imperfectly localised a together 

 which is more than a mathematical sum ; in fact, we rise 

 to the conception of individuality that which cannot 

 be divided and put together again out of its parts. 



The second property is still more remarkable. The 

 world of the " epi-phenomena," of the inner processes 

 which accompany the highest forms of nervous develop- 

 ments in human beings, is capable of unlimited growth ; 

 and it is capable of this by a process of becoming ex- 

 ternal : it becomes external, and, as it were, perpetuates ss. 



Externalisa- 



itself in language, literature, science and art, legislation, tionand 



' growth of 



society, and the like. We have no analogue of this in mind - 

 physical nature, where matter and energy are constant 

 quantities, and where the growth and multiplication of 

 living matter is merely a conversion of existing matter 

 and energy into special altered forms without increase or 

 decrease in quantity. But the quantity of the inner 

 thing is continually on the increase ; in fact, this increase 

 is the only thing of interest in the whole world. 



Now, no exact scientific treatment of the phenomena 

 of mind and body, no psycho-physical view of nature, is 

 complete or satisfactory which passes by and leaves un- 

 defined these two remarkable properties of the inner life, 

 of the epi-phenomena of nervous action, of consciousness. 

 And it seems to me that Prof. Wundt is the only psycho- 39. 



Wundt's 



physicist who, starting from science and trying to pene- *2J|*3? nto 

 trate by scientific methods into the inner or psychic P roblem - 



