thought, but pleasant or unpleasant sense-perception has the relation of affirmation or negation,” therefore of the positive and negative determination of thought. “And to perceive the pleasant or unpleasant is to employ the activity” (spontaneity) “of the middle state of sense-perception upon good or evil, in so far as they are such. But desire and aversion are the same in energy; it is only in manifestation that they are different. To the reasoning soul pictorial conceptions take the place of sense-perceptions, and when the mind affirms or denies something to be good or bad, it desires or avoids its object. It has the relation both of unity and limit. The understanding,” as that which determines opposites, “recognizes the forms underlying pictorial conceptions; and in the same manner as what is desirable in them and what is to be avoided have been determined for it, so it also is determined independently of actual sense-perceptions when it is in mental conceptions. And when, in dealing with conception or thought, as if seeing them, it compares the future with the present and passes judgment accordingly, and determines what is pleasant or unpleasant in this respect; it desires or seeks to avoid it, and in general it finds itself in practical operation. But independently of action true and false are of the same character as good or evil.” b. PRACTICAL PHILOSOPHY. From this the conception of will, or the practical element is shown to us, and it has to be reckoned as still belonging to the Philosophy of Mind. Aristotle has treated it in several works which we now possess. α. ETHICS. We have three great ethical works: the Nicomachean Ethics (Ἠθικὰ Νικομάχεια) in ten books, the Magna Moralia (Ἠθικὰ μεγάλα) in two books, and the Eudemean Ethics (Ἠθικὰ Εὐδήμια) in seven books; the last deals for the most part with particular virtues, while in the first two general investigations on the principles are contained. Just as the best that we even now possess in reference to psychology is what we have obtained from Aristotle, so is it with his reflections on the actual agent in volition, on freedom, and the further determinations of imputation, intention, &c. We must simply give ourselves the trouble to understand these, and to translate them into our own form of speech, conception and thought; and this is certainly difficult. Aristotle follows the same course here as in his Physics, determining one after the other, in the most thorough and accurate fashion, the many moments which appear in desire: the purpose, the decision, voluntary or forced action, the act of ignorance, guilt, moral responsibility, &c. I cannot enter upon this somewhat psychological presentation of the subject.[102] I shall only make the following remarks on the Aristotelian definitions.