Abstract
For many years pulmonary embolism and tho thromboembolic phenomenon has avidly hold the interest of many of those connected with tho field of medicine. Once the signs anti symptoms of thromboembolic disease become manifest, the diagnosis of such an entity is not seemingly difficult, however, the diagnosis of this entity before these signs and symptoms occur has proven to be extremely difficult. By the time the diagnosis is made in many of these cases a fatallity has occurred or occurs shortly thereafter. One may be reasonably certain that by the tine a thrombosis or embolism is detected this! thrombosis or embolism has been present for several hours at least, and many times for several days before there is evidence of clinical manifestation. | It has been my endeavour to do research work in regards to this subject, primarily with respect to the detection of the presence of a venous thrombosis of the lower extremity and to study sane of the physiological changes about the venous thrombosis by a thermal method.