[Footnote 1: _Geography and Classification of Animals_, p. 350.]
[Footnote 2: These expressions occur in Chapter IX. of the earlier editions (to the ninth) of the _Principles of Geology_.]
[Footnote 3: L. Agassiz, _Lake Superior_, p. 377.]
From Darwinism: An Exposition of the Theory of Natural Selection by Alfred Russel Wallace.
[Footnote 1: _Geography and Classification of Animals_, p. 350.]
[Footnote 2: These expressions occur in Chapter IX. of the earlier editions (to the ninth) of the _Principles of Geology_.]
[Footnote 3: L. Agassiz, _Lake Superior_, p. 377.]