600 CEREBRAL MENTAL SUBSTRATA. 



These processes are apparently as free from subjective acconi' 

 paniments as are the actual molecular processes thereby in- 

 cited in the Muscle itself. It is the altered condition of the 

 Muscle thus induced, and of contiguous parts as occa- 

 sioned by the Movement, which together engender a body 

 of ingoing impressions, the terminus for which is the 

 Kinsesthetic Centre. This, therefore, is a true Sensory 

 Centre, and in it ' ideal movements ' may be revived, either 

 alone or conjointly, with related Visual Impressions. 



The Kinsesthetic Centre is, indeed, one of great impor- 

 tance. Its impressions enter inextricably into a large 

 majority of our mental processes — as widely and inextric- 

 ably, in fact, as the assumed ' muscular consciousness * 

 of Bain is supposed by him and others to be intertwined 

 with what they would distinguish as ' passive ' sensibilities. 

 But it can only produce an extreme amount of confusion, 

 if the activity of this Sensory Centre is attributed to and 

 confounded with that of Motor Centres, the processes of 

 which seem to lie even more truly outside the sphere 

 of Mind than the molecular processes comprised in the 

 actual contraction of a Muscle : these latter processes are 

 at least immediately followed by 'ingoing' impressions, 

 whilst so far as we know — that is so far as any evidence 

 exists — the former are not. 



The Cerebral substrata of Mind, therefore, in no way 

 include, as the writer believes, the processes taking place 

 in the Motor Centres of the Cerebrum, wheresoever they 

 may be situated. Mental operations, in other words, can no 

 longer be legitimately postulated as being, in part, imme- 

 diately due to the activity of Motor Centres. Nor can 

 'ideal' Words be rightly described as * motor processes.* 

 This is a point so fundamental that in regard to it there 

 should be no misunderstandings or ambiguities, other than 

 those which may be inherent in the subject itself. 



