'On the Soul' is Aristotle's philosophical treatise on the nature of life and all things living. Aristotle's exposition centers on, as on would expect from the title of the work, the soul. Aristotle's soul however is not the same as the common modern conception of something distinct from the body that could live on past death, rather Aristotle defines the soul as the form or essence of a living thing and wholly inseparable from that living being. Philosophers, theologians and students alike will find Aristotle's discourse 'On the Soul' of much interest.