ANDREWARTHA, H. G. The Use of Conceptual Models in Population Ecology 219 PITELKA, FRANK A. Some Aspects of Population Structure in the Short-term Cycle of the Brown Lemming in Northern Alaska 237 ECOLOGY OF NATURAL POPULATIONS, II MILNE, A. Theories of Natural Control of Insect Populations 253 BLAIR, W. FRANK. Changes in Vertebrate Populations under Conditions of .Drought 273 CHITTY, DENNIS. Self-regulation of Numbers through Changes in Viability 277 KLUYVER, H. N. Roosting Habits, Sexual Dominance and Survival in the Great Tit 281 ERRINGTON, PAUL L., Of Population Cycles and Unknowns 287 ECOLOGY OF NATURAL POPULATIONS, III UDVARDY, MIKLOS D. F. An Evaluation of Quantitative Studies in Birds 301 REYNOLDSON, T. B, Population Fluctuations in Urceolaria mitra (Peritricha) and Enchytraeus albidits (Oligochaeta) and their Bearing on Regulation 313 WANGERSKY, P. J., and CUNNINGHAM, W. J. Time Lag in Population Models 329 THE STRUCTURE OF COMMUNITIES CALHOUN, JOHN B. Social Welfare as a Variable in Population Dynamics 339 DUNCAN, OTIS DUDLEY. Population Distribution and Community Structure 357 KONTKANEN, P AAVO. On the Delimitation of Communities in Research on Animal Bioenotics 373 SUTTER, JEAN, and TRAN-NGOC-TOAN. The Problem of the Structure of Isolates and of their Evolution among Human Populations 379 THE POPULATION AS A UNIT OF EVOLUTION DOBZHANSKY, THEODOSIUS. Mendelian Populations as Genetic Systems 385 LEWONTIN, R. C. The Adaptations of Populations to Varying Environments 395 SHAPIRO, HARRY L. The PopulatIon Unit and Culture 409 CONCLUSION HUTCHINSON, G. EVELYN. Concluding Remarks 415
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