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It would seem that the chairman's address should deal with a subject which is of interest to gastro-enterologists and proctologists alike, and for this reason I have chosen to call or recall attention to the question of the diagnosis and prognosis of epithelial tumors of the large bowel. Tumors actually arising from the bowel epithelium must be differentiated masses projecting into the bowel lumen and are merely covered with bowel mucosa. In cases in which the bowel mucosa covering a mass is normal there is no question, but when the mucosa is ulcerated or when a tumor has broken through the mucosa and is projecting into the bowel lumen, as is sometimes the case with prostatic carcinoma or metastatic nodes in the rectovesical pouch, or culdesac of Douglas, some confusion may arise. Certain tumors arising in the bowel wall, such as lipomas or myxomas, may give this picture, as may