198 



Campbell has described degenerative changes as the result 

 of extensive disease of the posterior nerve roots. 



As already indicated, this centre must act as a chart of the 

 surface of the body, stimulation of any definite part of the 

 body leading to changes in the definite part of the centre, and 



Flo. 101. To show the mapping out of the Cerebral Cortex on its outer and 

 inner aspects into areas by the character and distribution of the cells and 

 fibres. (CAMPBELL.) 



these changes are accompanied by sensations referred to^the 

 part stimulated. 



We know nothing of the locality of centres connected with 

 the thermal and muscular senses. 



B. Storing and Associating Mechanism. The existence of a 

 special part or parts of the brain connected with the storing 



