because of the way in which relations complicate
themselves in groups which seem like single rela-
tions; and also because of the elaborate processes
through which we learn to perceive certain of these
systems. We can develop in this chapter only the
general line of analysis to which this content must
be submitted, and amplify only enough for the pur-
poses of the other portions of our work which come
into close connection herewith.

The most conspicuous peculiarity of relation-
content is that it has no definitely assignable ner-
vous process corresponding to it. We know of no
"centre " in the brain for the perception of relations,
and we do not know that it is a cortical function at
all. We must not suppose that perceived relations
depend on, or are functions of " brain-paths," or
"association fibres;" brain-paths represent simply
connections established between different factors
of content, by the operation of which the factors
function together; the physiological connection is
not the same thing as the experienced connection
or relation, and the physiological connection may
function perfectly whether a specific relation is
experienced or not. It is true that there are a
number of motor processes which assist in the per-
ception of relation, but their neural consequences

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