Page:Darwinism by Alfred Wallace 1889.djvu/426

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402
DARWINISM
CHAP.
FIG. 34.—Diagram illustrating the Geological Distribution of Plants.
FIG. 34.—Diagram illustrating the Geological Distribution of Plants.

The diagram (Fig. 34), slightly modified from one given by Mr. Ward, will illustrate our present knowledge of the development of the vegetable kingdom in geological time.