504 THE FUNCTIONAL RELATIONS OF THE 



Oerebellnm would be established earlier than those in relation with 

 Voluntary Actions, in animals in whom the former class of Move- 

 ments are much more frequent and numerous than the latter. 



To suppose that the ingoing (or * sensory ') fibres of the Cere- 

 bellum merely convey to this organ incitations, which cause certain 

 ganglionic elements in its cortical Grey Matter to ' discharge ' 

 themselves along definitely correlated outgoing fibres (so as to 

 arouse various lower Motor Centres in particular modes of com- 

 bination), enables us to account for the sensory relations of the 

 Upper and Lower Cerebellar Peduncles without looking upon the 

 Cerebellum itself as a kind of ' sensorium commune ' — as it was 

 erroneously regarded by Foville and others.* If it is to minister 

 to the execution of * automatic ' Movements, instigated by all 

 kinds of ' ingoing ' Impressions, it is obvious that it must be 

 brought into relation with these (perhaps mainly through 'inter- 

 nuncial ' fibres), though it is not at all necessary that the incidence 

 of such Impressions upon the Cerebellum should be attended by 

 any phases of Consciousness. 



Lower motor centres in the Spinal Cord are in immediate rela- 

 tion, through * internuncial ' fibres, Trith corresponding sensory 

 centres. The Cerebellum would seem also to be in relation with 

 multitudes of fibres of this type reaching it from more or less 

 distant ' sensory ' centres of difi'erent kinds. There is no more 

 reason, however, in consequence of such a relation, for attributing 

 * sensory' functions to the Cerebellum, than there would be for 

 attributing similar functions to the grey matter in the anterior 

 horns of the Spinal Cord. Such relations with ' sensory ' nuclei 

 or centres are indispensable for a Motor Centre, whether its position 

 be high or low : only the higher it is the more numerous are these 

 connections likely to be. 



Although some of the facts concerning the connections of the 

 Cerebellum with * ingoing ' nerves have been better suljstantiated 

 in the Brains of lower Vertebrates than in that of Man, they are 



* Or without having recourse to any such hypothesis as that 

 of Herbert Spencer (" Principles of Psychology," vol. i. p. 61), to 

 the effect that " the Cerebellum is an organ of doubly-compound 

 co-ordination in space," concerned with the co-ordination of co- 

 existent Impressions and Acts, just as the " Cerebrum is an 

 organ of doubly-compound co-ordination in time," and therefore 

 concerned with sequential Impression.s and Acts. 



