The autopsy reports of the Pathological Institute Erfurt of the period from 1.1. 1951 untile 31.12. 1969 were scored for cases of coronary sclerosis and coronary thrombosis and analysed concerning frequency and distribution of age and sex, resp. In 3.97 per cent of all autopsies (4.93 per cent of men, 2.62 per cent of women) a coronary sclerosis was present in combination with a coronary thrombosis. Coronary thrombi appeared more frequent in severe coronary sclerosis (8.96%) than in weak or moderately severe coronary sclerosis (1.39%). Males suffered significantly more frequent from these forms of icaemic heart disease. Coronary thrombi were found more frequently in the left coronary artery (2.46%) than in the right coronary (1.51%). This difference was significant. Non obturating thromboses were more frequent than obturating ones and those being in organization were rarer than fresh thromboses. In all cases a decrease of the relative frequency of the coronary thrombosis with increasing age in men and women is detected.