340 ANIMAL NATURE AS A WHOLE. [in. 



impressions without a previous animal action being necessarily 

 implied (33). ii. Primary internal impressions, independent of 

 conceptions, with the condition just stated. In these no pre- 

 vious animal action is necessarily implied (490). iii. The in- 

 ternal impressions, arising from those conceptions, desires, 

 aversions, &c. that are mental, and not sensational in their 

 nature, when considered independently of their remote sensa- 

 tional origin, since in these the brain receives impressions from 

 conceptions formed solely according to psychological laws, and 

 not necessarily in dependence on any other animal action {76). 



668. All the remaining forces are naturally subordinate to 

 others, as for example, — i. The internal impression developed 

 from unfelt and reflected external impressions ; for in this case, 

 the internal impressions on the nerve implies the reflexion of 

 an external impression (421). ii. The internal impression from 

 external sensations and sensational conceptions, desires, in- 

 stincts, &c. ; since these are dependent on animal- sentient 

 forces excited from without (66). iii. All those mentioned, 

 § 667, if the condition there stated as necessary be wanting. 



669. The animal forces which are naturally subordinate to 

 others, are, — i. Unfelt external impressions, which, by being re- 

 flected, excite internal impressions, ii. Those external impres- 

 sions which excite sensations, sensational desires, aversions, &c. 

 iii. Internal impressions not connected with conceptions, in so 

 far as they are reflected on other nerves in their course down- 

 wards (500) : and iv. The internal impressions of conceptions, 

 but with similar conditions (137). 



670. Those animal forces which are not naturally subordi- 

 nate to any other, are all those just mentioned, when the 

 conditions are not present ; or, in other words, when unfelt ex- 

 ternal impressions cause unfelt direct nerve-actions simply (418, 

 443) ; or if, when they excite no direct nerve- actions (445), are 

 prevented naturally from being transmitted along the nerve, 

 and are either reflected (426, 199), or felt (47, &c.), or, in so 

 far as internal impressions not dependent on conceptions, or 

 those of conceptions, are not reflected on other nerves in their 

 course downwards (485, 124). 



671 . The animal machines of an animal are all in connection 

 with each other, and constitute a special system of animal ma- 

 chines. In those endowed with brain, the nerves are only 



