The Thymus

The sudden burst of interest in the thymus during the last five years more than justifies the appearance of a monograph on those aspects of its function which bear particularly on immunity and the processes associated with the development of malignant disease. Of those who are actively working in the field I believe that Dr. DONALD METCALF is uniquely suited to produce such a work. His demonstration of a lymphocytosis stimulating factor from thymic tissue in 1956 was almost the first evidence of