Note 106 — Chapter I · SPECULATIVE PHILOSOPHY IN GREECE, BEFORE AND IN THE TIME OF SOKRATES.

The great principle of Herakleitus, which Aristotle states in order to reject (Physic. viii. 3, p. 253, b. 10, φασί τινες κινεῖσθαι τῶν ὄντων οὐ τὰ μὲν τὰ δ’ οὐ, ἀλλὰ πάντα καὶ ἀεὶ· ἀλλὰ λανθάνειν τοῦτο τὴν ἡμετέραν αἴσθησιν) now stands averred in modern physical philosophy. Mr. Grove observes, in his instructive Treatise on the Correlation of Physical Forces, p. 22:

“Of absolute rest, Nature gives us no evidence. All matter, as far as we can discern, is ever in movement: not merely in masses, as in the planetary spheres, but also molecularly, or throughout its intimate structure. Thus every alteration of temperature produces a molecular change throughout the whole substance heated or cooled: slow chemical or electrical forces, actions of light or invisible radiant forces, are always at play; so that, as a fact, we cannot predicate of any portion of matter, that it is absolutely at rest.”