Hodgkin's disease and lymphosarcoma, while not common conditions, are not rare. Since attention was attracted to this type of disease by the reports of Hodgkin in 1832, and especially by the contributions of Samuel Wilks in 1856 and 1865, much effort has been expended in attempts to determine the etiology, with but little success. Owing chiefly to the work of Dorothy Reed,1the pathology of the Hodgkin's type of lymphoma is well established. In general, this is also true of lymphosarcoma, but many cases are encountered in which it is not easy even by careful microscopic study positively to differentiate it from certain allied conditions. Many forms of treatment, medical and surgical, have been tried. Various drugs have been advocated from time to time, but, aside from brief and transient improvement in certain cases, the fatal course of the disease has not been greatly impeded. Nor has surgical excision