LOW INTELLIGENCE OF REPTILES AND FISHES. 387 
b, education, and being performed under the direction of 
_ an Intelligence much higher than the boasted reasoning 
: sae of Man. 
3 485. In the classes of Reprimes and Fisues, the manifesta- 
_ tions of Intelligence are so slight as to be scarcely distin- 
_ guishable. We find them capable of such an amount of 
_ education as enables them to recognise individuals from whom 
_ they have been accustomed to receive food ; but they seem to 
have very little further power of profiting by experience ; and 
we sea not find that individuals ever shape-out for themselves 
a new course which can be regarded as purely rational. This 
very low grade of Intelligence obviously corresponds with 
_ the very rudimentary development of the Cerebrum in these 
classes (§§ 453, 454). 
_ The contrast between Instinct and Intelligence will be more 
fully displayed in a future Chapter ; in which also a general 
_ account will be given of the Mental Operations to which the 
_ Cerebrum of Man is subservient. 
CHAPTER X1L 
ON SENSATION, AND THE ORGANS OF THE SENSES. 
486. Aut save the very lowest kinds of Animals possess, 
_ there is good reason to believe, a consciousness of their own 
existence, first derived from a feeling of some of the 
taking place within themselves ; and also a greater or less 
} amount of sensibility to the condition of external things. 
_ How far any such endowment can be possessed by creatures 
| which are destitute of a nervous system, and which are little 
_ else than particles of animated jelly, may be questioned. But 
there can be no reasonable doubt that where a nervous 
system exists, whatever consciousness any Animal may - ‘pos- 
sess of that which is taking place within or around itself, is 
yall derived from impressions made upon the extremities of 
certain of its nervous fibres ; which, being conveyed by them 
to the central sensorium, are : there felt (§ 430). Of the mode 
' ’ in which the impression, hitherto a change of a material cha- 
tacter, is there made to act upon the mind, we are absolutely 
) "ignorant ; we only know the fact. Hence, although we com- 
; cco2 
