=174.= The conception of ‘body’ therefore replaces in the Stoic system the various elements which the Ionic philosophers assumed as the basis of the universe, and combines both parts of such dualistic elements as were assumed by Democritus, Anaxagoras and Aristotle. Since it is the foundation of all things it must be capable of taking very various shapes. In logic we have met with it under the name of the ‘substratum’ (τὸ ὑπάρχον, _id quod est_)[9], but it none the less includes the ‘subject’ or feeling and reasoning mind. In the universe as a whole it is ‘essence’ (οὐσία, _essentia_); in its parts it is ‘matter’ (ὕλη, _silva_)[10]; but it also appears, possessed of intelligence, as the deity[11], and again is identified with ‘breath’ or ‘spirit[12],’ and through this with the human soul[13]. Even in ethics it has its place; for all causes are bodily, and not least ‘the good’ and the respective virtues, all of which are bodies, for they act upon body[14]; similarly the emotions such as anger and melancholy, are of the nature of body[15]. [Sidenote: Motion, space and time.] =175.= The Stoic ‘body’ in all its transformations is active and alert. It contains in itself the principle or power of movement; for though we observe that one body is set in motion by another, yet this could not be the case unless in the beginning there had been a body which had movement of itself[16]. As to the nature of the primal movement, the Stoics agree with Anaximenes that it may be described as alternate rarefaction and condensation. Rarefaction is a wave or ‘spirit’ spreading from the centre to the extremities; condensation is a contrary movement from the extremities to the centre[17]. The extension of body is ‘space,’ which therefore does not exist of itself, but only as a function of body[18]. Where there is no body (and body is limited), there is no space, but only the ‘boundless void’ beyond the universe[19]; of this we cannot say that it ‘exists’; rather it ‘not exists.’ Time also does not exist of itself, but only in the movement of body[20]. Neither space nor time existed before the universe, but have been all along bound up with it[21]. [Sidenote: Body comprises life and thought.]