TABLE OF CONTENTS 



PAGE 



List of Illustrations xxi 



PART I. INTRODUCTORY AND HISTORICAL 



Chapter I. Introduction 3 



What Organic Evolution Is — Definitions 3 



The Modern Attitude as to the Truth of the Evolution Doctrine . 5 



What Organic Evolution Is Not 8 



Chapter II. Historical Account of the Development op the 



Evolution Theory ic 



Evolution among the Greeks n 



Post-Aristotelians 14 



The Early Theologians 14 



The Revival of Science 15 



The Great Naturalists of the Eighteenth Century 16 



Lamarck 18 



Cuvier and Geoff roy St. Hilaire 21 



Catastrophism and Uniformitarianism 22 



The Reawakening of the Evolution Idea 23 



Charles Darwin 24 



Summary of Darwin's Theories 25 



Contemporary Opinion Regarding the Validity of Darwin's Views 2 7 



Isolation Theories 32 



Orthogenesis Theories 33 



The Mutation Theory of De Vries 36 



The Rise and Vogue of Biometry 3S 



Experimental Breeding 39 



Mendel's Laws 4 1 



Hybridization and the Origin of Species 43 



Neo-Mendelian Developments 43 



Heredity and Sex 44 



The Experimental Induction of Hereditary Variations .... 45 



The Recent Attack upon Evolution in the United States ... 45 



Concluding Remarks 46 



PART II. EVIDENCES OF ORGANIC EVOLUTION 



Chapter III. Is Organic Evolution an Established Principle? . 49 



Chapter IV. The Fundamental Postulate Underlying All Evi- 

 dences of Evolution 53 



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