Theories of acquired immunity -- Cellular vs. humoral immunity -- Theories of antibody formation -- The generation of diversity: the germline/somatic mutation debate -- The clonal selection theory challenged: the immunological self -- The concept of immunologic specificity -- Specificity continued -- Horror autotoxicus: the concept of autoimmunity -- Allergy and immunopathology: the "price" of immunity -- Anti-antibodies and anti-idiotypic immunoregulation: 1899-1904 -- Transplantation and immunogenetics -- Magic bullets and poisoned arrows: the uses of antibodies -- The royal experiment: 1721-22 -- The languages of immunologic dispute -- The search for cell-bound antibodies : on the influence of dogma -- 'Natural' antibodies and 'virgin' lymphocytes: the importance of context -- The dynamics of conceptual change in immunology -- Immunology in transition 1951-1972: the role of international meetings and discipline leaders -- The origin of subdisciplines: (ocular immunology; pediatric immunology; immunophysiology) -- Immune hemolysis: on the heuristic value of an experimental system -- Darwinism and immunology: from Metchnikoff to Burnet -- The end of immunology? -- Appendix A1. The calendar of immunologic progress -- Appendix A2. Seminal discoveries -- Appendix A3. Important books in immunology, 1892 -- 1968 -- Appendix B. Nobel Prize highlights in immunology -- Appendix C. Biographical dictionary.