The article reports about the fourth biennial course on Current Methods of Immunologic Research and Diagnosis, offered by the Center for Immunology of the State University of New York, held at Buffalo, New York, in July, 1975. It also reports about the fifth International Congress of Lymphology, held at Buenos Aires, Argentina and Rio de Janeiro, Brazil, between March 23 and 29, 1975. Some of the sessions that have been presented are, lymphomas; lymphatic dissemination of cancer; lymphoedema and chylous refluxes; medical and surgical treatment; and basic lymphology.