n a Process of Interaction 507
3. Classification of the Materials 511

II. Materials

A. The Struggle for Existence
1. Different Forms of the Struggle for Existence.
_J. Arthur Thomson_ 513
2. Competition and Natural Selection. _Charles Darwin_ 515
3. Competition, Specialization, and Organization. _Charles Darwin_ 519
4. Man: An Adaptive Mechanism. _George W. Crile_ 522

B. Competition and Segregation
1. Plant Migration, Competition, and Segregation. _F. E. Clements_ 526
2. Migration and Segregation. _Carl Buecher_ 529
3. Demographic Segregation and Social Selection.
_William Z. Ripley_ 534
4. Inter-racial Competition and Race Suicide. _Francis A. Walker_ 539

C. Economic Competition
1. Changing Forms of Economic Competition. _John B. Clark_ 544
2. Competition and the Natural Harmony of Individual Interests.
_Adam Smith_ 550
3. Competition and Freedom. _Frederic Bastiat_ 551
4. Money and Freedom. _Georg Simmel_ 552

III. Investigations and Problems
1. Biological Competition 553
2. Economic Competition 554
3. Competition and Human Ecology 558
4. Competition and the "Inner Enemies": the Defectives, the
Dependents, and the Delinquents 559

_Selected Bibliography_ 562
_Topics for Written Themes_ 562
_Questions for Discussion_ 563

CHAPTER IX. CONFLICT

I. Introduction
1. The Concept of Conflict 574
2. Classification of the Materials 576

II. Materials

A. Conflict as Conscious Competition
1. The Natural History of Conflict. _W. I. Thomas_ 579
2. Conflict as a Type of Social Interaction. _Georg Simmel_ 582
3. Types of Conflict Situations. _Georg Simmel_ 586

B. War,