ace at the present epoch.
The most important part of all this adjustment in his case, as he stands
now, consists doubtless in that nervous activity which is intellectual.
The mentality attached to his cerebrum includes reason in higher measure
than is possessed by the mentality of other animals. He, therefore, more
than they, can profitably forecast the future and act suitably to meet
it from memory of the past. The cerebrum has proved itself by his case
the most potent weapon existent for extending animal dominance over the
environment.

_Means and Present Aims of Physiological Study of the Brain._--The
aspects of cerebral activity are therefore twofold. There is the
contribution which it makes to the behaviour of the animal as seen in
the creature's doings. On the other hand there is its product in the
psychical life of the animal. The former of these is subject matter for
physiology; the latter is especially the province of psychology.
Physiology does, however, concern itself with the psychical aspect of
cerebral functions. Its scope, embracing the study of the bodily organs
in regard to function, includes the psychic as well as the material,
because as just shown the former inextricably interlace with the latter.
But the relation between the psychic phenomena and the working of the
brain in regard to any data of fundamental or intimate character
connecting the two remains practically as unknown to us as to the Greek
philosophers. What physiology has at present to be content with in this
respect is the mere assigning of certain kinds of psychic events to
certain local regions of the cerebrum. This primitive quest constitutes
the greater part of the "neurology" of our day, and some advance has
been made along its lines. Yet how meagre are really significant facts
will be clear from the brief survey that follows. Before passing finally
from these general considerations, we may note that it becomes more and
more clear that the brain, although an organ than can be treated as a
whole, is complex in the sense that separable functions belong in some
measure to its several parts.

The means principally adopted in studying the functions of the
brain--and it must be remembered that this study in its present phase is
almost exclusively a mere search for localization--are four. These are
the physiological, the clinico-pathological, the histological and the
zoological. The first named proceeds by observing the effects of
artifi