2 1 4 Medicine : 



partitions being received as conveniences of 

 thought, not as sections and separations of sub- 

 stance, is inevitable, if all Nature be one process 

 of orderly evolution and the function of science 

 be to find it out. 



The absolute barrier between mind and bod)' 

 set up by metaphysics has in truth been a great 

 hindrance to the progress of positive science. 

 That mind works upon body to alter the rate 

 and quality of its functions, and, conversely, body 

 upon mind to affect its moods and thoughts, is a 

 truism, but a truism the full truth of which is 

 not realized because of the habit of setting mind 

 and body over against one another as separate 

 and independent entities. Between material 

 energy and consciousness there is a gulf, it is 

 true, just as there is between one mode of per- 

 ception and another and between one mode of 

 physical force and another ; but it is not possible 

 in biology to set up a partition between mind and 

 body. Mind works in every function of the body ; 

 a sound body is the foundation of a sound mind ; 

 and the lunatic is lunatic to his finger-ends. 

 Moreover, they surely disclose one another, 

 although by more subtile writing than we can 

 yet read. It is not by the medium of words only 

 that thoughts and feelings are expressed. They 

 are expressed by other motions that are sufficiently 

 distinct to be perceptible by sense — by subtile 

 motions of look, gesture, gait, attitude, and the 

 like ; the differences of which in different persons 



