CHAP. XXVI. 1 VOLUNTARY MOVEMENTS. 571 



most briefly set forth by quoting Ferrier's description of 

 some observations made upon an animal, certain parts of 

 whose Cerebrum had been previously submitted to electrical 

 stimulation, and in whom the initial irritative changes were 

 speedily followed by destructive morbid processes, involv- 

 ing the same parts of the Cerebral Cortex. 



Ferrier says (' Functions of the Brain,' p. 200; : " The first ex- 

 periment I have to record is instructive as showing the respective 

 effects of irritation and destruction of the convolutions bounding 

 the fissure of Eolando. The right hemisphere of a monkey ha- 



FIG. 181. Lateral View of the Brain of a Monkey, showing the boundaries of the 

 so-called 'motor area' of the right Cerebral Hemisphere. (Ferrier.) c, Fissure of 

 Rolando ; d, the parietal lobule ; e, the ascending frontal convolution. 



been exposed and subjected to experimentation with electrical irri- 

 tation. The part exposed included the ascending parietal, ascend- 

 ing frontal, and posterior extremities of the frontal convolutions. 

 The animal was allowed to recover, for the purpose of watching 

 the effects of exposure of the brain. Next day the animal was found 



better in the brief space which we can here devote to this subject 

 to confine our observations to the results of experiments with 

 these particular animals, though many others have been experi- 

 mented upon by Dr. Ferrier. 



