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Chapter XVII. HOW BODIES ARE MIXED AND CONTEMPERATED ONE WITH ANOTHER.
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THE ancient philosophers held that the mixture of elements proceeded from the alteration of qualities; but the disciples of Anaxagoras and Democritus say it is done by apposition. Empedocles composes the elements of still smaller bulks, those which are the most minute and may be termed the elements of elements. Plato assigns three bodies (but he will not allow these to be elements, nor properly so called), air, fire, and water, which are mutable into one another; but the earth is mutable into none of these.
Chapter XVIII. OF A VACUUM.
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ALL the natural philosophers from Thales to Plato rejected a vacuum. Empedocles says that there is nothing of a vacuity in nature, nor any thing superabundant. Leucippus, Democritus, Demetrius, Metrodorus, Epicurus, that the atoms are infinite in number; and that a vacuum is infinite in magnitude. The Stoics, that within the compass of the world there is no vacuum, but beyond it the vacuum is infinite. Aristotle,We should probably here read Pythagoras. (G.) that the vacuum beyond the world is so great that the heaven has liberty to breathe into it, for the heaven is fiery.
Chapter XIX. OF PLACE.
