to Mr.
Mill, I have indicated an analogy between those effects of emotional
experiences out of which I believe moral sentiments have been developed,
and those effects of intellectual experiences out of which I believe
space-intuitions have been developed. Rightly considering that the first
of these hypotheses cannot stand if the last is disproved, Mr. Hutton
has directed part of his attack against this last. But would it not have
been well if he had referred to the _Principles of Psychology_, where
this last hypothesis is set forth at length, before criticising it?
Would it not have been well to give an abstract of my own description of
the process, instead of substituting what he _supposes_ my description
must be? Any one who turns to the _Principles of Psychology_ (first
edition, pp. 218-245), and reads the two chapters, "The Perception of
Body as presenting Statical Attributes", and "The Perception of Space",
will find that Mr. Hutton's account of my view on this matter has given
him no notion of the view as it is expressed by me; and will, perhaps,
be less inclined to smile than he was when he read Mr. Hutton's account.
I cannot here do more than thus imply the invalidity of such part of Mr.
Hutton's argument as proceeds upon this incorrect representation. The
pages which would be required for properly explaining the doctrine that
space-intuitions result from organized experiences may be better used
for explaining this analogous doctrine at present before us. This I will
now endeavour to do; not indirectly by correcting misapprehensions, but
directly by an exposition which shall be as brief as the extremely
involved nature of the process allows.

An infant in arms, when old enough to gaze at objects around with some
vague recognition, smiles in response to the laughing face and soft
caressing voice of its mother. Let there come some one who, with an
angry face, speaks to it in loud, harsh tones. The smile disappears, the
features contract into an expression of pain, and, beginning to cry, it
turns away its head, and makes such movements of escape as are possible.
What is the meaning of these facts? Why does not the frown make it
smile, and the mother's laugh make it weep? There is but one answer.
Already in its developing brain there is coming into play the structure
through which one cluster of visual and auditory impressions excites
pleasurable feelings, and the structure through which another cluster of
visual an