I. Processes and history:- 1. The genetic basis of evolution -- 2. Charles Lyell -- 3. Charles Darwin -- 4. Crises in the history of life -- II. Intraindividual variation:- 5. The living cell -- 6. Mammalian eggs in the laboratory -- 7. The genetic code -- 8. How do cells differentiate? -- 9. The skin -- 10. Electrical effects in bone -- 11. The antiquity of human walking -- 12. Human growth -- III. Intrapopulation variation:- 13. Ionizing Radiation and evolution -- 14. The evolution of the hand -- 15. Adaptations to cold -- 16. Tools and human evolution -- 17. The origin of speech -- 18. Learning to think -- 19. Sickle cells and evolution -- 20. The genetics of the Dunkers -- IV. Interpopulation variation:- 21. The distribution of man -- 22. The lesson of the pygmies -- 23. World population -- 24. The origins of new world civilization -- 25. The prehistory of the Australian Aborigine -- 26. Homo erectus -- 27. The early relatives of man