100 CONSCIOUSNESS AND SENSATION. 



tained to be the organs without which none of at 

 least the higher acts of consciousness can be per- 

 formed, are a pair of highly corrugated vesicles, 

 closely connected one with the other, and continu- 

 ous with the rest of the brain by the lower margins 

 of the inlets into the cavities of the vesicles, where 

 are situated the corpora striata. The structure 

 throughout the different lobes and convolutions of 

 the hemispheres, notwithstanding minor differences, 

 is fundamentally the same. Their grey matter con- 

 sists of strata of nerve-corpuscles and nucleated pro- 

 toplasm, and the vast majority of the corpuscles are 

 connected with fibres ascending from the corpora 

 striata and with others which lie horizontally, that 

 is, parallel to the surface, while they send another 

 stronger process perpendicularly outwards. The 

 horizontal fibres exist throughout the thickness of 

 the grey matter, but are massed particularly in 

 a varying number of strata, while others of them 

 coat the surface in various places. We have thus 

 an arrangement fitted to allow consentaneous 

 action of the whole grey matter of the hemisphere, 

 but nothing pointing to different functions of the 

 different regions. The convolutions are accounted 

 for when it is considered that they bring the 

 vascular supply within easy reach of every part 

 of the grey matter, and the minor differences of 



