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The Anaxagorean chaos is not an immediately evident conception; in order to grasp it one must have understood the conception which our philosopher had with respect to the so-called "Becoming." For in itself the state of all heterogeneous "Elementary-existences" before all motion would by no means necessarily result in an absolute mixture of all "seeds of things," as the expression of Anaxagoras runs, an intermixture, which he imagined as a complete pell-mell, disordered in its smallest parts, after all these "Elementary-existences" had been, as in a mortar, pounded and resolved into atoms of dust, so that now in that chaos, as in an amphora, they could be whirled into a medley. One might say that this conception of the chaos did not contain anything inevitable, that one merely needed rather to assume any chance position of all those "existences," but not an infinite decomposition of them; an irregular side-by-side arrangement was already sufficient; there was no need of a pell-mell, let alone such a total pell-mell. What therefore put into Anaxagoras' head that difficult and complex conception? As already said: his conception of the empirically given Becoming. From his experience he drew first a most extraordinary proposition on the Becoming, and this proposition necessarily resulted in that doctrine of the chaos, as its consequence.
The observation of the processes of evolution in nature, not a consideration of an earlier philosophical system, suggested to Anaxagoras the doctrine, that All originated from All; this was the conviction of the natural philosopher based upon a manifold, and at the bottom, of course, excessively inadequate induction. He proved it thus: if even the contrary could originate out of the contrary, e.g., the Black out of the White, everything is possible; that however did happen with the dissolution of white snow into black water. The nourishment of the body he explained to himself in this way: that in the articles of food there must be invisibly small constituents of flesh or blood or bone which during alimentation became disengaged and united with the homogeneous in the body. But if All can become out of All, the Firm out of the Liquid, the Hard out of the Soft, the Black out of the White, the Fleshy out of Bread, then also All must be contained in All. The names of things in that case express only the preponderance of the one substance over the other substances to be met with in smaller, often imperceptible quantities. In gold, that is to say, in that which one designates a potiore by the name "gold," there must be also contained silver, snow, bread, and flesh, but in very small quantities; the whole is called after the preponderating item, the gold-substance.
But how is it possible, that one substance preponderates and fills a thing in greater mass than the others present? Experience shows, that this preponderance is gradually produced only through Motion, that the preponderance is the result of a process, which we commonly call Becoming. On the other hand, that "All is in All" is not the result of a process, but, on the contrary, the preliminary condition of all Becoming and all Motion, and is consequently previous to all Becoming. In other words: experience teaches, that continually the like is added to the like, e.g., through nourishment, therefore originally those homogeneous substances were not together and agglomerated, but they were separate. Rather, in all empiric processes coming before our eyes, the homogeneous is always segregated from the heterogeneous and transmitted (e.g., during nourishment, the particles of flesh out of the bread, &c), consequently the pell-mell of the different substances is the older form of the constitution of things and in point of time previous to all Becoming and Moving. If all so-called Becoming is a segregating and presupposes a mixture, the question arises, what degree of intermixture this pell-mell must have had originally. Although the process of a moving on the part of the homogeneous to the homogeneous—i.e., Becoming—has already lasted an immense time, one recognises in spite of that, that even yet in all things remainders and seed-grains of all other things are enclosed, waiting for their segregation, and one recognises further that only here and there a preponderance has been brought about; the primal mixture must have been a complete one, i.e., going down to the infinitely small, since the separation and unmixing takes up an infinite length of time. Thereby strict adherence is paid to the thought: that everything which possesses an essential "Being" is infinitely divisible, without forfeiting its specificum.
According to these hypotheses Anaxagoras conceives of the world's primal existence: perhaps as similar to a dust-like mass of infinitely small, concrete particles of which every one is specifically simple and possesses one quality only, yet so arranged that every specific quality is represented in an infinite number of individual particles. Such particles Aristotle has called Homoiomere in consideration of the fact that they are the Parts, all equal one to another, of a Whole which is homogeneous with its Parts. One would however commit a serious mistake to equate this primal pell-mell of all such particles, such "seed-grains of things" to the one primal matter of Anaximander; for the latter's primal matter called the "Indefinite" is a thoroughly coherent and peculiar mass, the former's primal pell-mell is an aggregate of substances. It is true one can assert about this Aggregate of Substances exactly the same as about the Indefinite of Anaximander, as Aristotle does: it could be neither white nor grey, nor black, nor of any other colour; it was tasteless, scentless, and altogether as a Whole defined neither quantitatively nor qualitatively: so far goes the similarity of the Anaximandrian Indefinite and the Anaxagorean Primal Mixture. But disregarding this negative equality they distinguish themselves one from another positively by the latter being a compound, the former a unity. Anaxagoras had by the assumption of his Chaos at least so much to his advantage, that he was not compelled to deduce the Many from the One, the Becoming out of the "Existent."
Of course with his complete intermixture of the "seeds" he had to admit one exception: the Nous was not then, nor is It now admixed with any thing. For if It were admixed with only one "Existent," It would have, in infinite divisions, to dwell in all things. This exception is logically very dubious, especially considering the previously described material nature of the Nous, it has something mythological in itself and seems arbitrary, but was however, according to Anaxagorean prœmissa, a strict necessity. The Mind, which is moreover infinitely divisible like any other matter, only not through other matters but through Itself, has, if It divides Itself, in dividing and conglobating sometimes in large, sometimes in small masses, Its equal mass and quality from all eternity; and that which at this minute exists as Mind in animals, plants, men, was also Mind without a more or less, although distributed in another way a thousand years ago. But wherever It had a relation to another substance, there It never was admixed with it, but voluntarily seized it, moved and pushed it arbitrarily—in short, ruled it. Mind, which alone has motion in Itself, alone possesses ruling power in this world and shows it through moving the grains of matter. But whither does It move them? Or is a motion conceivable, without direction, without path? Is Mind in Its impacts just as arbitrary as it is, with regard to the time when It pushes, and when It does not push? In short, does Chance, i.e., the blindest option, rule within Motion? At this boundary we step into the Most Holy within the conceptual realm of Anaxagoras.