The question.--The two theories of man's origin.--The argument purely historical.--Means of tracing man's ancestry and history.--Classification.--Ontogenesis and Phylogenesis. Amoeba: Its anatomy and physiology.--Development of the cell.--Hydra: The development of digestive and reproductive organs, and of tissues.--Forms intermediate between amoeba and hydra: Magosphæra, volvox.--Embryonic development.--Turbellaria: Appearance of a body wall, of ganglion, and nerve-cords.…
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