The Thoracic Duct has been wounded, and also cut and ligatured without bad results. Its communications with the azygos veins in the posterior mediastinum and lymphatic vessels of the right side may serve to explain this. The duct conveys carcinoma at an early period from certain abdominal affections, particularly those about the stomach, and hence, in suspected malignant disease of the stomach, it is always well to inspect the left supraclavicular glands. In many such cases of carcinoma the emaciation is largely due to blocking of the duct with carcinoma.