Wherever many closely allied yet distinct species occur, doubtful forms and varieties belonging to the same groups likewise occur.

It is a rule of high generality that the inhabitants of each area are related to the inhabitants of the nearest source whence immigrants might have been derived.

We see this in the striking relation of nearly all the plants and animals of the Galapagos Archipelago, of Juan Fernandez, and of the other American islands, to the plants and animals of the neighbouring American mainland; and of those of the Cape de Verde Archipelago, and of the other African islands to the African mainland.

It must be admitted that these facts receive no explanation on the theory of creation.

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