TABLE OF CONTENTS 



PAGE 



List of Illustrations • xvii 



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 



u Chapter II. Historical Account of the Development of the 



Evolution Theory 10 



Evolution among the Greeks n 



.( Post-Aristotelians i4 



Y J The Early Theologians . , i4 



V The Revival of Science i5 



The Great Naturalists of the Eighteenth Centur>^ 16 



Lamarck ^" 



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 27 



Isolation Theories 3~ 



Orthogenesis Theories 33 



Mutation or Heterogenesis Theories 36 



The Rise and Vogue of Biometry 3^ 



Modern Experimental Evolution 39 



Mendel's Laws 4i 



Hybridization and the Origin of Species 43 



Neo-Mendelian Developments 43 



Heredity and Sex 44 



The Experimental Induction of Heredity Variations ..... 45 



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



Concluding Remarks 46 



Chapter III. The Relation of Evolution to Materialism. Joseph 



Le Conte 47 



