64 CEREBRAL FORCES. [i. 



those conceptions which arise directly either from external sen- 

 sations, or from primary spontaneous conceptions (118). Or, 

 in other words, as the conceptions arise from and follow the 

 primary material ideas ; so, also, all the material ideas belong- 

 ing to the secondary conceptions arise from and succeed each 

 other in virtue of the cerebral force put into action by the 

 primary material ideas (112). We are ignorant, however, of 

 these processes. 



120. So soon, however, as the actions of the material ideas 

 are extended beyond the brain to the nerves, whether tliey put 

 mechanical machines into motion at the same time or not, many 

 traces of them can be discovered, and it is these which we have 

 now to consider (117, ii). We will first, however, notice the 

 actions of material ideas through the nerves generally; or, in 

 other words, of the proper cerebral force (121 — 111), and 

 afterwards their actions as manifested solely in the nerves, and 

 not in mechanical machines. — (Vide §§ 142 — 152.) 



Actions of Material Ideas through the Nerves generally : the 

 Internal Lnpression in the Brain. 



121. Material ideas are to be considered as impressions made 

 by conceptions (acts of mind) on the brain, for even those pro- 

 duced by external impressions only arise when the latter excite 

 external sensations ; and we can discover no other source for 

 those which accompany the intellectual conceptions, than the 

 conceptions themselves (25, 112). To distinguish these im- 

 pressions from external impressions, we will term them, for want 

 of a better phrase, internal senselike impressions, senselike impres- 

 sions on the brain — internal nerve-feeling ; and include, under 

 these terms, all impressions made on the cerebral origin of a 

 nerve, or on its trunk, and transmitted downwards from the 

 brain, in a direction contrary to that taken by the external im- 

 pi'ession (31, 32, 406).^ Although a nerve may receive an 

 internal impression which is not derived from the brain, just 

 as it may receive an external impression which does not reach 

 the brain (47, 199), still internal impressions on the nerves, 



> The reader is particularly requested to refer to § 31, and the foot-note appended 

 thereto, for an explanation of the word sinnlich, here translated senselike. In accord- 

 ance with the views there stated, the word sinnliche Eindriick, here used, will be 

 translated simply impression. 



