[24] The sense of smell
is gradually specialized, and when taste also begins to develop a kind of
chemical sense is constituted. The organ of smell, however, speedily
begins to rise in importance as we ascend the zooelogical scale. In the
lower vertebrates, when they began to adopt a life on dry land, the sense
of smell seems to have been that part of their sensory equipment which
proved most useful under the new conditions, and it developed with
astonishing rapidity. Edinger finds that in the brain of reptiles the
"area olfactoria" is of enormous extent, covering, indeed, the greater
part of the cortex, though it may be quite true, as Herrick remarks, that,
while smell is preponderant, it is perhaps not correct to attribute an
exclusively olfactory tone to the cerebral activities of the _Sauropsida_
or even the _Ichthyopsida_. Among most mammals, however, in any case,
smell is certainly the most highly developed of the senses; it gives the
first information of remote objects that concern them; it gives the most
precise information concerning the near objects that concern them; it is
the sense in terms of which most of their mental operations must be
conducted and their emotional impulses reach consciousness.
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