life-giving principle to man, nay, even is actually his soul, it would appear to be a just inference that the infinite air is God and that the gods and goddesses have sprung from it. Such was the philosophy of Anaximenes. It was the beginning of that stimulation of activity by rival schools which played so distinguished a part in the Greek intellectual movement. Its superiority over the doctrine of Thales evidently consists in this, that it not only assigns a primitive substance, but even undertakes to show by observation and experiment how others arise from it, and transformations occur. As to the discovery of the obliquity of the ecliptic by the aid of a gnomon attributed to Anaximenes, it was merely a boast of his vainglorious countrymen, and altogether beyond the scientific grasp of one who had no more exact idea of the nature of the earth than that it was "like a broad leaf floating in the air." [Sidenote: Diogenes asserts that air is the soul of the world.] The doctrines of Anaximenes received a very important development in the hands of Diogenes of Apollonia, who asserted that all things originate from one essence, which, undergoing continual changes, becoming different at different times, turns back again to the same state. He regarded the entire world as a living being, spontaneously evolving and transforming itself, and agreed with Anaximenes that the soul of man is nothing but air, as is also the soul of the world. From this it follows that the air must be eternal, imperishable, and endowed with consciousness. "It knows much; for without reason it would be impossible for all to be arranged so duly and proportionately as that all should maintain its fitting measure, winter and summer, night and day, the rain, the wind, and fair weather; and whatever object we consider will be found to have been ordered in the best and most beautiful manner possible." "But that which has knowledge is that which men call air; it is it that regulates and governs all, and hence it is the use of air to pervade all, and to dispose all, and to be in all, for there is nothing that has not part in it." [Sidenote: Difficulty of rising above fetichism.] [Sidenote: Astronomy and chemistry have passed beyond the fetich stage.]