By means of 3H-thymidine, radioautographic investigation of lymphocytopoiesis has been performed in the cortex and medulla of the rat thymus for 2 weeks after birth. In the newborn animals the index of labelled nuclei (ILN) in the medulla is higher than in the cortex. By the 14th day after birth a progressive drop of lymphocytes including the isotope takes place in the medulla. The decrease of ILN in the medulla occurs against the background of increasing amount of epithelioreticulocytes with vacuoles and dystrophic changes in the nucleus and cytoplasm, that make groups of Hassal's bodies.
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