The International Congresses of Angiology have had a 25-year tradition. Let us remember the 10 previous International Congresses, the first of which took place in Paris in 1952. On this occasion a stimulus for the foundation of the International Union, "Union Internationale d Angeiologie" came into existence. The period of 25 years is lon.qenough to evaluate the scientific progress which has been made in diagnosis, therapy and prevention of vascular diseases. Proceedings of the previous International Congresses of Angiology became attractive resources for scientific information in libraries all over the world. They represent really historic documents of remarkable development of angiology and wittness successful international cooperation in the settlement of serious medical problems of the twentieth century. The Proceedings of the XI. International Congress of Angiology held in Prague 1978 under the stimulating title "Adaptability of Vascular Wall" contains 284 original papers dealing with scientific and clinical research in arterial, venous and lymphatic circulation. The papers are incorporated into 12 chapters according to the main topics. In the first sections the questions of atherogenesis and thrombogenesis are discussed with regard to the adaptability of vascular wall in various metabolic, immunobiologic, and hemodynamic disorders. In the further sections attention is paid to new procedures in investigation, treatment, and prevention of arterial, venous, and lymphatic diseases. Peri- pheral microangiopathies, renovascular hypertension, and coronary circulation represent another part.