De anima

On the Soul (Greek Περὶ Ψυχῆς, Peri Psuchēs; Latin De Anima) is a major treatise written by Aristotle c.350 B.C.E on the nature of living things. His discussion centres on the kinds of souls possessed by different kinds of living things, distinguished by their different operations. Thus plants have the capacity for nourishment and reproduction, the minimum that must be possessed by any kind of living organism. Lower animals have, in addition, the powers of sense-perception and self-motion (action) Humans have all these as well as intellect.

Aristotle holds that the soul (, ) is the form, or essence of any living thing; that it is not a distinct substance from the body that it is in. That it is the possession of soul (of a specific kind) that makes an organism an organism at all, and thus that the notion of a body without a soul, or of a soul in the wrong kind of body, is simply unintelligible. (He argues that some parts of the soul—the intellect—can exist without the body, but most cannot.) It is difficult to reconcile these points with the popular picture of a soul as a sort of spiritual substance "inhabiting" a body. Some commentators have suggested that Aristotle's term soul is better translated as lifeforce.

In 1855, published a translation titled On the Vital Principle; George Henry Lewes, however, found this description also wanting.

The treatise is divided into three books, and each of the books is divided into chapters (five, twelve, and thirteen, respectively). The treatise is near-universally abbreviated “DA,” for “De anima,” and books and chapters generally referred to by Roman and Arabic numerals, respectively, along with corresponding Bekker numbers. (Thus, “DA I.1, 402a1” means “De anima, book I, chapter 1, Bekker page 402, Bekker column a [the column on the left side of the page], line number 1.)

DA I.1 introduces the theme of the treatise;
DA I.2–5 provide a survey of Aristotle’s predecessors’ views about the soul

DA II.1–3 gives Aristotle’s definition of soul and outlines his own study of it, which is then pursued as follows:
DA II.4 discusses nutrition and reproduction;
DA II.5–6 discuss sensation in general;
DA II.7–11 discuss each of the five senses (in the following order: sight, sound, smell, taste, and touch—one chapter for each);
DA II.12 again takes up the general question of sensation;

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