locus perforatus, the pyriform lobe, the paraterminal body, and
the whole hippocampal formation. The neopallium is the dorsal cap
of the brain, with frontal, parietal, and occipital areas,
comprehending all that part of the brain which is the seat of the
higher associative activities, reaching its fullest development
in man.

"In the early mammals the olfactory areas form by far the greater
part of the cerebral hemisphere, which is not surprising when it
is recalled that the forebrain is, in the primitive brain,
essentially an appendage, so to speak, of the smell apparatus.
When the cerebral hemisphere comes to occupy such a dominant
position in the brain it is perhaps not unnatural to find that
the sense of smell is the most influential and the chief source
of information to the animal; or, perhaps, it would be more
accurate to say that the olfactory sense, which conveys general
information to the animal such as no other sense can bring
concerning its prey (whether near or far, hidden or exposed), is
much the most serviceable of all the avenues of information to
the lowly mammal leading a terrestrial life, and therefore
becomes predominant; and its particular domain--the
forebrain--becomes the ruling portion of the nervous system.

"This early predominance of the sense of smell persists in most
mammals (unless an aquatic mode of life interferes and deposes
it: compare the _Cetacea, Sirenia_, and _Pinnipedia_, for
example) even though a large neopallium develops to receive
visual, auditory, tactile, and other impressions pouring into the
forebrain. In the _Anthropoidea_ alone of nonaquatic mammals the
olfactory regions undergo an absolute (and not only relative, as