CONTENTS 



PART II. 

 THE EVOLUTION OF THE REALM OF ORGANISMS. 



LECTURE XI. 



PAGE 



THE CONCEPT OF EVOLUTION 353 



§ 1. A Question of Terms, 353— § 2. The Evolution of Organ- 

 isms Contrasted with Inorganic Genesis, 356 — § 3. Organic 

 Evolution Contrasted with the History of Human Societies, 

 359— §4. Definition of the Concept of Organic Evolution, 360 

 — § 5. May Evolution Have Been a Process of Analytic Sim- 

 plifying, not of Synthetic Complexifying?, 361— § 6. The 

 Logical Validity of the Evolution Formula, 367— § 7. Diffi- 

 culties in the Way of Concrete Evolution Theory Lead to 

 Hypotheses of Transcendental Underpinning, 370 — § 8. In 

 What Sense Is Organic Evolution Continuous?, 373 — §9. In 

 What Sense Is Organic Evolution Progressive?, 375. 



LECTURE XII. 



GREAT STEPS IN ORGANIC EVOLUTION 383 



§ l.The Origin of Organisms upon the Earth, 383— § 2. The 

 Nature of the First Organisms, 387 — § 3. Establishment of 

 Diverse Types of Cellular Organisation, 388— § 4. The Diver- 

 gence of Green Plants, 389— § 5. The Making of Bodies, 390— 

 §6. The Divergence of the Sexes, 391— § 7. Progressive Dif- 

 ferentiations and Integrations, 392 — § 8. Rise and Progress 

 of Backboned Animals, 394— § 9. The Ascent of Man, 397— 

 § 10. General Impressions of Animate Evolution, 397. 



LECTURE XIII. 



ORIGINATIVE FACTORS IN EVOLUTION: VARIATION . . 407 



§ 1. The Central Problem of etiology Is the Origin of Heri- 

 table Variations, 407 — § 2. Variations Distinguished from 

 Modifications, 408 — §3. Discontinuous Variations (or Muta- 

 tions) and Continuous Variations (or Fluctuations), 410 — 

 §4. Problem of the Origin of Variations, 415— § 5. Correla- 

 tion of Variations, 424— § 6. Theory of Temporal Variations, 

 425— § 7. Evidences of Definiteness in Variability, 426— ■§ 8. 

 Germ-cells as Implicit Organisms, 428. 



lii 



9/^7 





H- 



c- 



StKtt 



