Chap. XXVL] VOLUNTARY MOVEMENTS. 669 



and what we as yet know of its anatomical connections i& 

 harmonious enough with this view. 



In what precise way the Cerebellum acts in the per- 

 formance of these functions, and more especially those in 

 which it co-operates with the Corpora Striata for the execu- 

 tion of Voluntary Movements, remains at present wholly 

 unknown. Neither, however, can we do more than con- 

 jecture, when we try to realize the mode in which the 

 Corpora Striata themselves react under Intellectual Incita- 

 tions upon the motor nuclei of the Medulla and Cord, 

 How is it that the initiating Idea, the Desire for a related 

 * end,' and the two-fold Conception of the necessary Move- 

 ments, as co-operating stimuli, are enabled to influence 

 the Corpora Striata, so as to evoke the Movements in 

 question ? The obscurity prevailing in regard to this prob - 

 lem cannot at present be removed. We possess no real 

 knowledge on the subject, and me rely suppose that Intel- 

 lect as it passes over into actio n — that is at the turning 

 point or * bend of the stream ' — whilst seeming to engender 

 a psychological ghost named 'Will/ operates by transmit- 

 ting suitable stimulations to the Corpora Striata ; and that 

 here again, perhaps under conjoint stimulation from the 

 Cerebellum, in some manner wholly unknown, other 

 sequential molecular actions are roused, as a result of 

 which incitations are sent to and through motor ' nerve- 

 nuclei ' in the M eduUa and Cord, appropriate for the per- 

 formance of the desired Movements. 



But another final set of questions in regard to the 

 execution of Voluntary Movements now remains to be 

 considered. We have pointed out the track taken by 

 cerebral incitations in their passage downw^ards from the 

 Corpora Striata, through the Cerebral Peduncles, Medulla, 

 and Cord, and thence through the anterior roots of Spinal 



