111. That a world of perishable things arises both in the second and fourth period is distinctly stated by Empedokles (fr. [17]), and it is inconceivable that he himself had not made up his mind which of these worlds is ours. Aristotle is clearly of opinion that it is the world which arises when Strife is increasing. In one place, he says that Empedokles “holds that the world is in a similar condition now in the period of Strife as formerly in that of Love.”[[598]] In another, he tell us that Empedokles omits the generation of things in the period of Love, just because it is unnatural to represent this world, in which the elements are separate, as arising from things in a state of separation.[[599]] This remark can only mean that the scientific theories contained in the poem of Empedokles assumed the increase of Strife, or, in other words, that they represented the course of evolution as the disintegration of the Sphere, not as the gradual coming together of things from a state of separation.[[600]] That is only what we should expect, if we are right in supposing that the problem he set himself to solve was the origin of this world from the Sphere of Parmenides, and it is also in harmony with the universal tendency of such speculations to represent the world as getting worse rather than better. We have only to consider, then, whether the details of the system bear out this general view.
Formation of the world by Strife.
112. To begin with the Sphere, in which the “four roots of all things” are mixed together, we note in the first place that it is called a god in the fragments just as the elements are, and that Aristotle more than once refers to it in the same way.[[601]] We must remember that Love itself is a part of this mixture,[[602]] while Strife surrounds or encompasses it on every side just as the Boundless encompasses the world in earlier systems. Strife, however, is not boundless, but equal in bulk to each of the four roots and to Love.
At the appointed time, Strife begins to enter into the Sphere and Love to go out of it (frs. 30, 31). The fragments by themselves throw little light on this; but Aetios and the Plutarchean Stromateis have between them preserved a very fair tradition of what Theophrastos said on the point.
Empedokles held that Air was first separated out and secondly Fire. Next came Earth, from which, highly compressed as it was by the impetus of its revolution, Water gushed forth. From the water Mist was produced by evaporation. The heavens were formed out of the Air and the sun out of the Fire, while terrestrial things were condensed from the other elements. Aet. ii. 6. 3 (Dox. p. 334; R. P. 170).
Empedokles held that the Air when separated off from the original mixture of the elements was spread round in a circle. After the Air, Fire running outwards, and not finding any other place, ran up under the solid that surrounded the Air.[[603]] There were two hemispheres revolving round the earth, the one altogether composed of fire, the other of a mixture of air and a little fire. The latter he supposed to be the Night. The origin of their motion he derived from the fact of fire preponderating in one hemisphere owing to its accumulation there. Ps.-Plut. Strom. fr. 10 (Dox. p. 582; R. P. 170 a).
The first of the elements to be separated out by Strife, then, was Air, which took the outermost position surrounding the world (cf. fr. [38]). We must not, however, take the statement that it surrounded the world “in a circle” too strictly. It appears that Empedokles regarded the heavens as shaped like an egg.[[604]] Here, probably, we have a trace of Orphic ideas. At any rate, the outer circle of the Air became solidified or frozen, and we thus get a crystalline vault as the boundary of the world. We note that it was Fire which solidified the Air and turned it to ice. Fire in general had a solidifying power.[[605]]
In its upward rush Fire displaced a portion of the Air in the upper half of the concave sphere formed by the frozen sky. This air then sunk downwards, carrying with it a small portion of the fire. In this way, two hemispheres were produced: one, consisting entirely of fire, the diurnal hemisphere; the other, the nocturnal, consisting of air with a little fire.
The accumulation of Fire in the upper hemisphere disturbs the equilibrium of the heavens and causes them to revolve; and this revolution not only produces the alternation of day and night, but by its rapidity keeps the heavens and the earth in their places. This was illustrated, Aristotle tells us, by the simile of a cup of water whirled round at the end of a string.[[606]] The verses which contained this remarkable account of so-called “centrifugal force” have been lost; but the experimental illustration is in the manner of Empedokles.
The sun, moon, stars, and earth.