Plutarch characterizes Anaximenes’ mode of representation which makes everything proceed from air—later on it was called ether—and resolve itself therein, better thus: “As our soul, which is air, holds us together (_συγρατεῖ_), one spirit (_πνεῦμα_) and air together likewise hold (_περιέχει_) the whole world together; spirit and air are synonymous.” Anaximenes shows very clearly the nature of his essence in the soul, and he thus points out what may be called the transition of natural philosophy into the philosophy of consciousness, or the surrender of the objective form of principle. The nature of this principle has hitherto been determined in a manner which is foreign and negative to consciousness; both its reality, water or air, and the infinite are a “beyond” to consciousness. But soul is the universal medium; it is a collection of conceptions which pass away and come forth, while the unity and continuity never cease. It is active as well as passive, from its unity severing asunder the conceptions and sublating them, and it is present to itself in its infinitude, so that negative signification and positive come into unison. Speaking more precisely, this idea of the nature of the origin of things is that of Anaxagoras, the pupil of Anaximenes. Pherecydes has also to be mentioned as the teacher of Pythagoras; he is of Syros, one of the Cyclades islands. He is said to have drawn water from a spring, and to have learned therefrom that an earthquake would take place in three days; he is also said to have predicted of a ship in full sail that it would go down, and it sank in a moment. Theopompus in Diogenes Laertius (I. 116), relates of this Pherecydes that “he first wrote to the Greeks about Nature and the gods” (which was before said of Anaximander). His writings are said to have been in prose, and from what is related of them it is clear that it must have been a theogony of which he wrote. The first words, still preserved to us, are: “Jupiter and Time and what is terrestrial (_χθών_) were from eternity (_εἰς ἀεί_); the name of earthly (_χθονίῃ_) was given to the terrestrial sphere when Zeus granted to it gifts.”[29] How it goes on is not known, but this cannot be deemed a great loss. Hermias tells us only this besides:[30] “He maintained Zeus or Fire (_αἰθέρα_), Earth and Chronos or Time as principles—fire as active, earth as passive, and time as that in which everything originates.” Diogenes of Apollonia, Hippasus, and Archelaus are also called Ionic philosophers, but we know nothing more of them than their names, and that they gave their adherence to one principle or the other.