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4. Secondary Contacts 331

_Bibliography: Materials for the Study of Social Contacts_ 332
_Topics for Written Themes_ 336
_Questions for Discussion_ 336

CHAPTER VI. SOCIAL INTERACTION

I. Introduction
1. The Concept of Interaction 339
2. Classification of the Materials 341

II. Materials

A. Society as Interaction
1. The Mechanistic Interpretation of Society. _Ludwig Gumplowicz_ 346
2. Social Interaction as the Definition of the Group in Time
and Space. _Georg Simmel_ 348

B. The Natural Forms of Communication
1. Sociology of the Senses: Visual Interaction. _Georg Simmel_ 356
2. The Expression of the Emotions. _Charles Darwin_ 361
3. Blushing. _Charles Darwin_ 365
4. Laughing. _L. Dugas_ 370

C. Language and the Communication of Ideas
1. Intercommunication in the Lower Animals. _C. Lloyd Morgan_ 375
2. The Concept as the Medium of Human Communication.
_F. Max Mueller_ 379
3. Writing as a Form of Communication. _Charles H. Judd_ 381
4. The Extension of Communication by Human Invention.
_Carl Buecher_ 385

D. Imitation
1. Definition of Imitation. _Charles H. Judd_ 390
2. Attention, Interest, and Imitation. _G. F. Stout_ 391
3. The Three Levels of Sympathy. _Th. Ribot_ 394
4. Rational Sympathy. _Adam Smith_ 397
5. Art, Imitation, and Appreciation. _Yrjoe Hirn_ 401

E. Suggestion
1. A Sociological Definition of Suggestion. _W. v. Bechterew_ 408
2. The Subtler Forms of Suggestion. _Albert Moll_ 412
3. Social Suggestion and Mass or "Corporate" Action.
_W. v. Bechterew_ 415

III. Investigations and Problems
1. The Process of Interaction 420
2. Communication