Views and Definitions of Species--How Darwin's differs from that of Agassiz, and from the Common View--Variation, its Causes unknown.--Darwin's Genealogical Tree--Darwin and Agassiz agree in the Capital Facts--Embryology--Physical Connection of Species compatible with Intellectual Connection--How to prove Transmutation.--Known Extent of Variation--Cause of Likeness unknown--Artificial Selection.--Reversion--Interbreeding--Natural Selection.--Classification tentative.--What Darwin assumes.--Argument stated.--How Natural Selection works.--Where the Argument is weakest.--Objections--Morphology and Teleology harmonized.--Theory not atheistical.--Conceivable Modes of Relation of God to Nature Ho…
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