1 Introduction to Genes.- 2 The March of Molecular Biology.- 3 Cellular Manipulations.- 4 Human Applications for the 'New' Biology.- 5 The Two Categories: External Impact and Internal Expression.- 6 Genetic Disease and the Nature of Differences Among Men.- 7 Towards Progress in Cancer.- 8 Immunological Surveillance and Ageing.- 9 Genetic Aspects of Mental Disease.- 10 The Population Problem.- 11 Aims and Limitations of Therapy.- 12 The New Outlook.