Prof. Owen on Life and Species. 63 
And with that ascent are associated brain-centers, progres- 
sively increasing in size and complexity. Arrest the develop- 
ment uman brain at the point it has reached in the 
‘Aztec,’ and the faculty of generalizing and giving expression 
to such generalizations is wanting. The Aztecs can articulate 
words, and apply the right noun to the thing, as e. g. * bread,’ 
‘chair ;? but they cannot combine ideas into propositions, and 
say ‘ give me bread,’ ‘ set me the chair,’ 
For such advance in intellectual acts more brain is essential. 
Compared with the normal state of brains in the brutes best 
endowed, so much more cerebral substance is required, and in 
such position, as to make the great and sudden rise, in the lowest 
és of man, which is referred to in vol. iii, p. 144. 
Thought relates to the ‘brain’ of man, as does electricity to 
the nervous ‘ battery’ of the torpedo : both are forms of force, 
and the results of action of their respective organs. 
ach sensation affects a cerebral fiber, and in so affecting it, 
gives it the faculty of repeating the action, wherein memory 
consists, and sensation in a dream 
A dog at the sight of a rabbit receives a sensation which in- 
duces a volition, and he barks with the excitement of the chase. 
sation, memory, dreamy ag 
ception of the rabbit reaches the ‘ soul’ of the dog by the affec- 
@ dog is its power of knowing what it sees and dete 1 /ac- 
cordingly : it may approach the object with every manifestation 
of sentiments of gladness and submissive affection : it may rush 
Upon it with every sign of rage: it may pursue it with every 
ea of excited ardor. 
