PART I.--Premonitions of Darwinism.--A Proper Subject for
Speculation.--Summary of Facts and Ideas suggestive of Hypotheses of
Derivation

Part II--Limitations of Theory conceded by Darwin.--What Darwinism
explains.--Geological Argument strong in the Tertiary Period.--
Correspondence between Rank and Geological Succession--Difficulties in
Classification.--Nature of Affinity.--No Absolute Distinction between
Vegetable and Animal Kingdoms.--Individuality.--Gradation

PART III.--Theories contrasted.--Early Arguments against
Darwinism.--Philosophical and Theological Objections--Theory may be
theistic.--Final Cause not excluded.--Cause of Variation unknown.--Three
Views of Efficient Cause compatible with Theism.--Agassiz's Objections of a
Philosophical Nature.--Minor Objections.--Conclusion


ARTICLE IV

SPECIES AS TO VARIATION,
GEOGRAPHICAL DISTRIBUTION,
AND SUCCESSION

Alphonse De Candolle's Study of the Oak Genus.--Variability of the
Species.--Antiquity.--A Common Origin probable.--Dr. Falconer on the Common
Origin of Elephants--Variation and Natural Selection
distinguished.--Saporta on the Gradation between the Vegetable Forms of the
Cretaceous and the Tertiary.--Hypothesis of Derivation more likely to be
favored by Botanists than by Zoologists.--Views of Agassiz respecting the
Origin, Dispersion, Variation, Characteristics, and Successive Creation of