Abstract
1. Lymph and lymphocyte outputs from thoracic and right lymphatic ducts of male rats have been measured. 2. Rate of flow and lymphocyte output of the thoracic duct was 1.8 ml/hr/kg and 42.9 million lymphocytes/hr/kg; right lymphatic duct values were 0.3 ml/hr/kg and 5.7 million lymphocytes/hr/kg. 3. Utilizing these data a Daily Replacement Factor for blood lymphocytes of 4.6 was obtained for the anesthetized rat. 4. These results have been compared with similar findings reported for other species.

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