Immunology is an inter-disciplinary science and immunological methods are required for research and investigation in a number of fields microbiology, biochemistry and molecular biology, endocrinology, pathology, haematology, clinical medicine, allergy and hypersensitivity clinics, and surgery for histocompatibility match needed for transplantation of organs. An attempt has been made to meet these diverse demands. Common methods used for diagnostic purposes are given, as also those required in a more sophisticated research laboratory. The style is simple and direct. The book is written in a manner that the investigator or technician generally familiar with common laboratory methods, but not necessarily conversant with immunological techniques, is able to undertake these exercises. It is a basic book for the postgraduate and research student in Life Sciences, Medicine and Veterinary Sciences. It will also be of utility to diagnostic and analytical laboratories and to the drug industries. 1 radioimmunoassays. 2 enzyme linked immunoassays. 3 complement system. 4 clinical immunology. 5 investigation for putting in evidence hypersensitivity allergic reactions. 6 transplantation immunology. 7 immunohaematology.