Adheres to the principle that immunology is best taught by examining those key experiments that have led to our present understanding of how the immune system works--not by simply lumbering students with a compendium of facts. Wherever possible, the book describes the original experiments and resulting data, ranging from classical experiments of the late 19th century to the very latest advances in molecular immunology. In addition, a final section discusses recent advances in immunology as they apply to human disease. The first text on immunology to use this experimental approach, it has been much-copied but remains the most comprehensive text of its type in the field and is suitable for courses at any undergraduate level.