I. Introduction 1. Geological and Biological Conceptions of Isolation 226 2. Isolation and Segregation 228 3. Classification of the Materials 230 II. Materials A. Isolation and Personal Individuality 1. Society and Solitude. _Francis Bacon_ 233 2. Society in Solitude. _Jean Jacques Rousseau_ 234 3. Prayer as a Form of Isolation. _George Albert Coe_. 235 4. Isolation, Originality, and Erudition. _T. Sharper Knowlson_ 237 B. Isolation and Retardation 1. Feral Men. _Maurice H. Small_ 239 2. From Solitude to Society. _Helen Keller_ 243 3. Mental Effects of Solitude. _W. H. Hudson_ 245 4. Isolation and the Rural Mind. _C. J. Galpin_ 247 5. The Subtler Effects of Isolation. _W. I. Thomas_. 249 C. Isolation and Segregation 1. Segregation as a Process. _Robert E. Park_ 252 2. Isolation as a Result of Segregation. _L. W. Crafts and E. A. Doll_ 254 D. Isolation and National Individuality 1. Historical Races as Products of Isolation. _N. S. Shaler_ 257 2. Geographical Isolation and Maritime Contact. _George Grote_ 260 3. Isolation as an Explanation of National Differences. _William Z. Ripley_ 264 4. Natural versus Vicinal Location in National Development. _Ellen C. Semple_ 268 III. Investigations and Problems 1. Isolation in Anthropogeography and Biology 269 2. Isolation and Social Groups 270 3. Isolation and Personality 271 _Bibliography: Materials for the Study of Isolation_ 273 _Topics for Written Themes_ 277 _Questions for Discussion_ 278 CHAPTER V. SOCIAL CONTACTS I. Introduction 1. Preliminary Notions of Social Contact 280 2. The Sociological Concept of Contact 281 3. Classification of the Materials 282 II. Materials A. Physical Contact and Social Contact 1. The Frontiers of Social Contact. _Albion W. Small_ 288 2. The Land and the People. _Ellen C. Semple_ 289 3. Touch and Social Contact. _Ernest Crawley_ 291