“…The In previous publications (Wetzler-Ligeti and Wiesner, 1937, 1938a, 1938b we have described the effects of various pituitary extracts upon the reticulo-endothelial system (RES) of the rabbit. Congo-red solution was injected intravenously and the rate at which the dye disappeared from the circulation was determined; this rate has been taken, in accordance with the view of previous authors (Adler and Reimann, 1925;Moncorps and Gunther, 1933 ;Dieryck, 1929;Stern and Willheim, 1935), as an index of the functional activity of the RES. It was found that certain anterior lobe extracts raised the Congo-red index by a considerable amount.…”