1. Small lymphocytes in serum at 37°C. migrate toward the anode under experimental conditions described.
2. The electromotive force of 0.8 volt per cm. under the same conditions produced a straight line velocity which approximated that reported by McCutcheon for spontaneous velocity after his preparation had been studied over 5 hours.
3. Keeping the lymphocytes on ice up to 30 hours did not produce an appreciable difference in velocity of straight line migration from that speed determined if the cells were studied immediately.
4. The possible relationships between the type and order of magnitude of the electromotive force passing between injured and normal tissues and the electromotive force used experimentally are briefly discussed.