CHAP. XXIV.] PRINCIPAL PARTS OF THE BRAIN. 495 



and Corpus Striatum, and perhaps, therefore, without much impli- 

 cating the convolutions of the Temporal Lobe, which, as will be 

 shown in the next chapter, appear to contain centres or regions of 

 special importance for sensory perception. These latter cases are 

 of great interest, but more accurate information would be required 

 before we could safely corne to any definite opinion in regard to 

 them. The old observations were not made or, at all events, were 

 not recorded in that rigorously precise manner which the impor- 

 tance of the subject, irom our present point of view, clearly 

 demands. 



But whilst our ' Will ' is, like our Intellect, single 

 (although it is the product or accompaniment of the ac- 

 tivity of a double organ), we are here, on the occasion of 

 its exercise, brought to the turning point where 'mental' 

 gradually give place to 'non-mental' phenomena. 



The outcome of many Volitions is to be found in mus- 

 cular contractions and relaxations, and the mere passage 

 of ' outgoing currents ' has no conscious accompaniment ot 

 any kind.* After the Wish or Desire with ' a sense of effort ' 

 (which together seem to make up what we individually 

 know of a Volition so far, that is, as it reveals itsell to us 

 as a phase of Consciousness), we have to do with mole- 

 cular currents passing, it may be, through several sets of 

 fibres and cells, but having no conscious side whatever, 

 and apparently lying just as much outside the sphere of 

 Mind as the molecular changes in the muscle which 

 these ' outgoing currents ' evoke. 



It was for these reasons that, in an earlier chapter, the 

 writer was led to limit the sphere of Mind, and to re- 

 gard that portion only of the Nervous System as its 

 organ which has to do with the reception, the trans- 

 mission, and with the vastly multiplied co-ordinations of 



* On this subject see what Sir Wm. Hamilton says in his 

 " Lectures," vol. ii. pp. 391, 392 ; also in his " Dissertations 

 on Reid," pp. 866, 867. 



