464 SCIENTIFIC THOUGHT. 



equally legitimate aspect, the unity of the complex as 

 the bearer of all the phenomena of higher or inner life 

 is equally important. In many ways it is a counter- 

 part of the other, showing a peculiar continuity of its 

 own, that continuity which I have made the special 

 subject of this work. In proportion as the biological 

 view of nature has become the science of the cell, 

 another science has grown up which sets itself to study 

 this higher phenomenon of living matter, the pheno- 

 menon of mind, directly by the methods of the exact 

 58. sciences. This is the modern Science of Psycho-physics. 



Transition . 



to psycho- Even the microscopist and biologist of the most modern 



physics. 



type are occasionally startled by phenomena akin to 

 those which commonly are only visible in the highest 

 organisms. Psychical existence, an inner side to the 

 external phenomena of motion, has accordingly been 

 attributed by eminent representatives of the mechanical 

 view of biological phenomena to the lowest, the most 

 primitive, unit of living matter. Another school of 

 science has set itself to study this inner side of liv- 

 ing organisms in its more perfect, as it were full- 

 grown, manifestations, and by appealing in addition to 

 the facts only known by introspection or self-conscious- 

 ness. With the history of this movement, so far as it 

 belongs to exact science, I propose to deal in the next 

 chapter under the general title of the Psycho-physical 

 View of Nature. 



