XXVIII.] MIND. 15 



Another remarkable fact which has a kindred bearing Analogous 

 to that last mentioned is, that consciousness perceives gi^ng'^from 

 various analogies bet^yeen the sensations of different senses, different 



S6I1S6S 



without the slightest approach to identity. Softness is a 

 sensation of touch, yet we speak of soft colour. Sweetness 

 is a sensation of taste, yet we speak of sweet sound. The 

 propriety of these expressions is felt by every one, yet 

 they are felt to be inexplicable : a real yet inexplicable 

 analogy is felt between impressions received from different 

 sensations. I believe that although the impressions of 

 different senses — soft objects of touch and soft colour, 

 sweet taste and sweet sound — are totally unlike in so 

 far as they are merely impressions of sense, yet the im- 

 pressions they produce on the consciousness are in some 

 degree similar. 



Another fact concerning consciousness is, that so soon Conscious- 

 as consciousness, from being conscious of sensations and j?®? }f-}^' 



° divisible. 



other feelings, becomes conscious of itself, it recognises 

 itself as being simple and indivisible. Unlike the rela- 

 tions between sensation and consciousness of which I have 

 spoken in the last two paragraphs, this is so obvious and 

 indisputable that no sane person could possibly doubt it, 

 and no proof or elucidation could make it more certain. 

 Biology, however, has shown the physical ground of this Biological 

 mental or metaphysical tru.th. The ground of the unity ground of 

 and indivisibility of consciousness, or the mind, is that nervous 

 centralization of the nervous system which in all classes H^^-^] ^^' 

 of animals appears to be a necessary condition of mind. 

 Mind, or any approach to a mental nature, appears to exist 

 only in the Vertebrata, the higher Articulata (such as insects 

 and spiders), and perhaps the Cephalopodous Mollusca; 

 and in all these classes the nervous system is not only 

 complex but centralized — all those parts of the nervous 

 system which control and dominate the rest being cen- 

 tralized in the head. The ganglia thus centralized in the 

 head are in the Vertebrata called the brain. This is really 

 a very complex organ, or rather a congeries of organs ; but 

 the unity of its action is so perfect that the mind feels 

 itself to be, and really is, not a mere congeries of func- 



