treatment of myocardial infarction.It was our purpose, in undertaking this study, to determine the results of anticoagulant therapy in myocardial infarction as it is carried out in a private hospital, in the daily practice of various physicians, as internists, cardiologists, and general practitioners and not by a research team. The dosage of the drug used and the prothrombin levels were adjusted by either the attending physician or the resident on his service. Hence, some kept the prothrombin levels rather low ; others, moderately low, while still others did not keep them low enough. No doubt, similar situations prevail in the daily practice in many hospitals throughout the country. We felt that a practical evaluation of anticoagulant therapy in myocardial infarction could be made more truly from such a study than from a controlled research project. Since some of the internists, cardiol-From the Department of Medicine, Mount Sinai Hospital. * References 1 and 2.t References 3-9. \s=dd\ References10 and 11. \ s=s\ References 12-21.