1 The biological role of allergy.- 2 Pharmacological mediators of allergy.- 3 Diagnostic tests.- I Prick, Scratch and intradermal tests.- II Patch tests.- III Challenge tests - oral, nasal and bronchial.- IV Laboratory techniques in immediate hypersensitivity.- 4 Allergy in infancy and childhood.- I Genetic aspects.- II Other aspects.- 5 Gastrointestinal reactions.- 6 Allergy and the skin.- 7 Respiratory allergy.- 8 Hyposensitization therapy.- 9 Allergy and other organs.- I Allergic disorders of the eye.- II Allergic disorders of the ear.- III Allergy and the kidney.- 10 Allergy, insects and arachnids.- 11 Drug allergies.- 12 The effect of antibacterial antibiotics on immune reactions and host resistance to infection.