_fact_ that his mind was directed to the solution of questions pertaining to the origin of the universe. It was these questions which marked the Ionian philosophers. It was these which showed the inquiring nature of their minds. What is the great first cause of all things? Thales saw it in one of the four elements of nature, as the ancients divided them. And it is the earliest recorded theory among the Greeks of the origin of the world. It is an induction from the phenomena of animated nature--the nutrition and production of a seed. [Footnote: Bitter, b. iii. c. 3; Lewes, ch. 1.] He regarded the entire world in the light of a living being gradually maturing and forming itself from an imperfect seed state, which was of a moist nature. This moisture endues the universe with vitality. The world, he thought, was full of gods, but they had their origin in water. He had no conception of God as _Intelligence_, or as a _creative_ power. He had a great and inquiring mind, but he was a pagan, with no knowledge of a spiritual and controlling and personal deity. [Sidenote: Anaximenes. Air the _animus mundi_.] Anaximenes, his disciple, pursued his inquiries, and adopted his method. He also was born in Miletus, but at what time is unknown, probably B.C. 529. Like Thales, he held to the eternity of matter. Like him, he disbelieved in the existence of any thing immaterial, for even a human soul is formed out of matter. He, too, speculated on the origin of the universe, but thought that _air_, not water, was the primal cause. [Footnote: Cicero, _De Nat. D_., i. 10.] This seemed to be universal. We breathe it; all things are sustained by it. It is Life-- that is pregnant with vital energy, and capable of infinite transmutations. All things are produced by it; all is again resolved into it; it supports all things; it surrounds the world; it has infinitude; it has eternal motion. Thus did this philosopher reason, comparing the world with our own living existence,--which he took to be air,--an imperishable principle of life. He thus advanced a step on Thales, since he regarded the world not after the analogy of an imperfect seed-state, but that of the highest condition of life,--the human soul. [Footnote: Ritter, b. iii. c. 3.] And he attempted to refer to one general law all the transformations of the first simple substance into its successive states, for the cause of change is the eternal motion of the air. [Sidenote: Diogenes. Air and soul identical.]