and diffuse is strengthened and becomes firm and transparent, so that they are nourished by such vapour as meets them, and well did Heraclitus[371] say that “Souls feed on smell in Hades.” XXIX. First they look on the moon herself, her size, her beauty, and her nature, which is not single or unmixed, but as it were a composition of earth and star. For as the earth has become soft by being mixed with air and moisture, and as the blood infused into the flesh produces sensibility, so the moon, they say, being mingled with air through all her depth, is endowed with soul and with fertility, and at the same time [Sidenote: F] receives a balance, lightness set against weight. Even so the universe itself, duly framed together of things having some an upward tendency, some a downward, is freed from all movement of place. This Xenocrates apprehended, it would seem, by some divine reasoning, having received the suggestion from Plato. For it is Plato[372] who showed that every star has been compounded of earth and fire by means of intermediate natures given in proportion, since nothing reaches the senses into which earth and light do not enter. But Xenocrates says that the stars and the sun are compounded out of fire and the [Sidenote: 944] first density, the moon out of the second density and her own air, and earth out of water, fire, and the third density; and that as an universal law, neither the dense alone nor the rarefied alone is capable of receiving soul. So much then for the substance of the moon. But her breadth and bulk are not what geometricians say, but many times greater. The reason why she but seldom measures the shadow of the earth with [three of] her own diameters, is not its smallness, but her heat, whereby she increases her speed that she may swiftly pass through and beyond the dark region, bearing from out it the souls of the good, as they hasten and cry aloud, for being in the shadow they no longer hear the harmony of heaven. At the same [Sidenote: B] time there are borne up from below through the shadow the souls of those who are to be punished, with wailing and loud cries. Hence comes the widespread custom of clanking vessels of brass during eclipses, with a din and a clatter to reach the souls. Also the face, as we call it, terrifies them, when they are near, so grim and weird is it to their sight. Really it is nothing of the kind; but as our earth has gulfs deep and great, one here which streams inwards towards us from the Pillars of Hercules, [Sidenote: C] outwards the Caspian, and those about the Red Sea, even such are those depths and hollows of the moon. The largest of them they call the Gulf of Hecate, where the souls endure and exact retribution for all the things which they have suffered or done ever since they became spirits; two of them are long, through which the souls pass, now to the parts of the moon which are turned toward heaven, now back to the side next to earth.