Note 61 — Chapter III · THE ACADEMY AND THE PORCH.
Reading edition
Zeno often calls it aether: ‘Zenon ... aethera ... interim vult omnium esse principium’ Min. Felix xix p. 58: Cleanthes calls it spirit, see below, § 100. ‘The fire of Heraclitus becomes aether or πῦρ τεχνικόν—for this distinction is unknown to the Ephesian—and is thereby spiritualised and rarefied’ Pearson, Fragments, Intr. pp. 22, 23.