Abstract
Summary
(1) Mice of certain inbred strains (C57Bl, Rf, and LAF1), when bled daily from tail veins, developed a prompt and persistent lymphocytosis. (2) High leukemia strains AkR and C58 did not show this response. (3) Thymectomy prevented this response but lymphocytosis was produced in thymectomized mice by injection of cell-free thymus extracts. Lymph node and spleen extracts were ineffective. (4) Adrenalectomy did not affect the lymphocytosis response.
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