This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables. Abstract "Tumors of Lymphoid Tissue" is a two-hundred-page monograph based on the study of 410 patients with lymphoma from Westminster Hospital and Westminster Medical School, London University. The text opens with a brief survey of the structure, function, and significance of lymphoid tissue and is followed by an historical survey of the subject. From here the author proceeds to terminology and classification and outlines his own classification of lymphomas based on morphology and cytogenesis. This classification places the lymphomas in the following four major categories: I. those characterized by primarily lymphocytic proliferation (follicular lymphoma and lymphosarcoma), II. those characterized by reticulum-cell proliferation (reticulum-cell sarcoma), III. those characterized by mixed cell proliferation (Hodgkin's disease and "reticular lymphoma"), and IV. anaplastic sarcoma, including anaplastic variants of all groups. The term "reticular lymphoma" is applied to the unusually benign type of Hodgkin's lymphoma which was described and called "early Hodgkin's" or "Hodgkin's paragranuloma" by