8 ' Psychophysical Evolution 



properly call ' psychic forces,' taken to include whatever 

 we, as psychologists, find it necessary to believe is involved 

 in the conception. The flow of the psychic, we find, how- 

 ever, so soon as we go over to the objective or ' psycho- 

 logical' point of view, is conditioned upon physiological 

 processes and functions — those of the brain and other 

 organs. These latter condition — limit, further, direct, 

 inhibit, in any way modify — the flow of the psychic 

 changes. Such conditions are ^ psychonomic' This term 

 may be used to denote the entire sphere of phenomena 

 which are in connection with the psychological, but which, 

 nevertheless, are not intrinsic to the series of psychic 

 changes as such. Psychology, when considered as the 

 science of mind, in its evolution as well as in its develop- 

 ment, — of mind, that is, looked at from the objective point 

 or view, — takes cognizance of the ' psychonomic ' ; but 

 when considered as a subjective science, as interpreting 

 its own data, it does not ; but, on the contrary, it confines 

 itself to the psychic. 



But now, and this is the essential point to remark in 

 our present connection, so soon as we ask the psycho- 

 physical question of genesis, — that of the development 

 and evolution of mind and body taken together, — pursu- 

 ing the biogenetic method, this limitation no longer rises 

 to trouble us. We include all psychophysical facts as such 

 in the definition of our science. Changes in mind and 

 body go on together, and together they constitute the phe- 

 nomena. Both organic and mental states and functions 

 may be appealed to in our endeavor to trace the psycho- 

 physical series of events as such, since both are objective 

 to the spectator, the scientific observer. 



The same relation between the intrinsic and the * nomic * 



