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S MR. DARWIN’S CRITICS 165 
_ particles of my nervous matter, caused by the 
- impact of a similar ball gives rise to the state of 
consciousness I call pain. In ultimate analysis 
everything is incomprehensible, and the whole | 
object of science is simply to reduce the funda- 
_ mental incomprehensibilities to the smallest possi- 
- ble number. 
But to return to the Quarterly Reviewer. He 
admits that animals have “mental images of 
‘sensible objects, combined in all degrees of com- 
_ plexity, as governed by the laws of association.” 
Presumably, by this confused and imperfect state- 
ment the Reviewer means to admit more than the 
words imply. For mental images of sensible 
— objects, even though “combined in all degrees of 
- complexity,” are, and can be, nothing more than 
mental images of sensible objects. But judg- 
ments, emotions, and volitions cannot by any 
possibility be included under the head of “ mental 
images of sensible objects.” If the greyhound 
had no better mental endowment than the 
_ Reviewer allows him, he might have the “mental 
image” of the “sensible object ”—the hare—and 
that might be combined with the mental images 
of other sensible objects, to any degree of com- 
plexity, but he would have no power of judging 
it to be at a certain distance from him; no power 
of perceiving its similarity to his memory of a 
hare; and no desire to get at it. Consequently 
he would stand stock still, and the noble art of 
