Imperfection of the Record.
Changes always in Progress.
Struggle for Existence between rival Terms and Dialects.
Causes of Selection.
Each Language formed slowly in a single Geographical Area.
May die out gradually or suddenly.
Once lost can never be revived.
Mode of Origin of Languages and Species a Mystery.
Speculations as to the Number of original Languages or
Species unprofitable.


CHAPTER 24.

BEARING OF THE DOCTRINE OF TRANSMUTATION ON THE ORIGIN OF MAN,
AND HIS PLACE IN THE CREATION.

Whether Man can be regarded as an Exception to the Rule if the
Doctrine of Transmutation be embraced for the rest of the
Animal Kingdom.
Zoological Relations of Man to other Mammalia.
Systems of Classification.
Term Quadrumanous, why deceptive.
Whether the Structure of the Human Brain entitles Man to form
a distinct Sub-class of the Mammalia.
Intelligence of the lower Animals compared to the Intellect and
Reason of Man.
Grounds on which Man has been referred to a distinct Kingdom
of Nature.
Immaterial Principle common to Man and Animals.