Chap. XXIV.] PRINCIPAL PARTS OF THE BRAIN. 501 



final 'sensory' and 'motor' couple, organized or attuned to some 

 extent, like inferior couples, for conjoint activity. 



It may, however, be at once acknowledged that the relation 

 between these supreme ingoing and outgoing centres in Man and 

 higher animals, must necessarily be very different and much more 

 complex than that existing between lower couples in the same 

 animals, or than that existing between the higher couples of 

 such animals as a Centi]pede, a Gasteropod (fig. 27) or any other 

 Invertebrate. 



The relations between ingoing impressions and responsive actions 

 through the intervening activity of lower centres in Man, or the 

 higher centres of a lower animal, are comparatively simple and 

 direct; but in higher animals, just as the organ of Conscious In- 

 telligence increases in internal complexity and bulk, so do the 

 chances increase of the intervention of complicated nervous pro- 

 cesses between the reception of certain Sensorial Impressions and 

 any actions which may ultimately result therefrom. The acts 

 that follow in such a case, as a result of 'deliberation,' ma}'- be 

 of a new and unaccustomed order — consciously conceived and 

 instigated. 



As Sensorial Consciousness, and the Intelligence that 

 grows out of its exercise, increases in intensity and com- 

 plexity, this side of life becomes all engrossing and the 

 Consciousness of the animal (or its Attention) is proportion- 

 ately diverted from its Visceral Sensations and Movements, 

 as well as from the greater part of the multitudinous ' auto- 

 matic ' and ' secondary-automatic ' Movements concerned 

 with its external life, or 'Life of Eelation.' The *area' 

 of Consciousness is limited in one direction and widened in 

 another, and new acquirements would never be made, 

 either in the sphere of Sense, of IntelligeDce or of Volun- 

 tary Movement, unless habitual and ever recurring Impres- 

 sions might of themselves (without engaging our Con- 

 sciousness) evoke related Movements — that is, unless these 

 latter could be executed and regulated under the super- 

 intendence of some great centre in response to mere ' unfelt ' 

 Impressions. Thus it becomes obvious that it would be 



