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36 confirms these remarks. In his Metaphysics (B. i. ch. 3) Aristotle says, that Thales was probably led to the opinion that water is the universal principle "from observing that all nourishment is moist, that heat is generated from moisture, and that life is sustained by heat. He observed that the seeds of all things were in their nature moist—this moisture they must derive from water; and hence Thales," continues Aristotle, "held that water was the principle from which all things proceeded."

5. Aristotle then goes on to consider how far this doctrine of Thales may have been traditional. "There are some," says he, "who think that our very remote ancestors entertained theological speculations of the same character concerning nature. For they made Oceanus and Tethys the parents of generation; and water, under the poetical name of Styx, this they made the oath of the gods; for that which is the most ancient is the most respected; but the oath is the most highly respected of all things." The meaning of this is, that the gods swear by Styx, that is, by water; but the gods swear by what they respect most, but what they respect most is the most ancient and the most permanent of all things, in other words, is the ultimately real and true; and, therefore, water being that which they swear by must be the ultimately real and true. Thus, you observe that Aristotle traces the opinion of Thales up to a theological tradition respecting the