Chapter X

The Origin of the Different Kinds 340
of Adaptations

– Form and Symmetry 340

– Mutual Adaptation of Colonial 350
Forms

– Degeneration 352

– Protective Coloration 357

– Sexual Dimorphism and Trimorphism 360

– Length of Life as an Adaptation 370

– Organs of Extreme Perfection 371

– Secondary Sexual Organs as 372
Adaptations

– Individual Adjustments as 375
Adaptations

– Color Changes as Individual 375
Adaptations

– Increase of Organs through Use 376
and Decrease through Disuse

– Reactions of the Organism to 377
Poisons, etc.

– Regeneration 379

CHAPTER XI

Tropisms and Instincts as 382
Adaptations

CHAPTER XII

Sex as an Adaptation 414

– The Different Kinds of Sexual 414
Individuals

– The Determination of Sex 422

– Sex as a Phenomenon of Adaptation 439

CHAPTER XIII

Summary and General Conclusions 452

INDEX 465

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EVOLUTION AND ADAPTATION