TABLE OF CONTENTS 
PAGE 
List OF ILLUSTRATIONS. . . . . 1. 2. 0. we) ee) XVEXVviil 
PART I. INTRODUCTORY AND HISTORICAL 
CHAPTER I. INTRODUCTION 
: 3 
What Organic Evolution Is—Definitions ‘ 2 3 
The Modern Attitude as to the Truth of the Evolution Techiine ; 5 
What Organic Evolution Is Not ee eS 8 
CHAPTER II. HuistoricaAL ACCOUNT OF THE DEVELOPMENT OF THE 
Evotution Totéory. H.H.N.. . . . oe ee we. TO 
Evolution among the Greeks . . . . . . . . . . . OI 
Post-Aristotelians. . . . . Be. Gb" Soe oe TE ee. en ay. PT 
The Early Theologians . . . ...... ~~. ~» 4 
The Revival of Science . . ee ae. ek. SHS) 
The Great Naturalists of the Eighteenth Century 6 Rh es & FO 
Lamarck . . Ee dey teh), Tash Fee, ced tis de? Tea, oS 
Cuvier and Geoffroy St. Hilaire. S ecti> ome waa ae» ae Ge oe ey VOT 
Catastrophism and Uniformitarianism. . . . . . . . . 22 
The Reawakening of the EvolutionIdea . . . . . . . .) 23 
Charles Darwin . . Rs WD Jue URL Se). ws ea. en SP 
Summary of Darwin’s "Theories ot 25 
Contemporary Opinion Regarding the Validity of Bicwin' s Miews 27 
Isolation Theories. . . . . . 2. . ee ee eee 82 
Orthogenesis Theories . . fo pce Se eS ee & 28S 
Mutation or Heterogenesis Theories Be Gt: adea Gh ee oe eh ee, 336 
The Rise and Vogue of Biometry . . . . ..... . 38 
Modern Experimental Evolution . . . . . . . . . .) 39 
Mendel’s Laws. . SR Bo ce A ae a Se 
Hybridization and the Origin oF Species dey Hae late che ch ee sa 
Neo-Mendelian eee nite nae gl a RE ele she ake ae CEN CAB 
Heredity and Sex. . . . om OR Bo ge 8 eS 44 
CHAPTER II]. Tse RELATION OF Evouuron TO MATERIALISM. 
Joseph Le Conte. . . 2. 1 we eee ee ee 46 
PART II. EVIDENCES OF ORGANIC EVOLUTION 
CHAPTER IV. Is Orcanic EVOLUTION AN ESTABLISHED PRINCIPLE? 
AHN 5) be. ee lee es SS ea as SE a Sg age ee, SF 
CHAPTER V. EVIDENCES FROM PALAEONTOLOGY . . . . . . O61 
Strength and Weakness of the Evidence . . . . . . . . 61 
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