The logic of the individual has been one of the most important problems of philosophy since Plato and Aristotle through Plotinus, Spinoza, and Leibniz to Kant and Hegel. Even for Nishida in modern Japan, it is the main theme with respect to his doctrine of 'acting intution'. Tanabe also attempts to interpret Aristotel's logic as that of the individual in terms of his own Triadic Logic of Species as the Dialectic. In the following, Tanabe's interpretation of the individual in relation to Aristotle may be elucidated from the perspective of the so-called 'Logic of Species'