Ueberweg examines and criticises the statements about Plato’s travels. He considers it probable that Plato passed some part of these thirteen years at Athens (Ueber die Aechtheit und Zeitfolge der Platon. Schrift. p. 126, 127). Mr Fynes Clinton thinks the same. F. H. B.C. 394; Append. c. 21, p. 366.
He commences his teaching at the Academy.
The spot selected by Plato for his lectures or teaching was a garden adjoining the precinct sacred to the Hero Hekadêmus or Akadêmus, distant from the gate of Athens called Dipylon somewhat less than a mile, on the road to Eleusis, towards the north. In this precinct there were both walks, shaded by trees, and a gymnasium for bodily exercise; close adjoining, Plato either inherited or acquired a small dwelling-house and garden, his own private property.[23] Here, under the name of the Academy, was founded the earliest of those schools of philosophy, which continued for centuries forward to guide and stimulate the speculative minds of Greece and Rome.
[23] Diog. Laert. iii. 7, 8; Cic. De Fin. v. 1; C. G. Zumpt, Ueber den Bestand der philosophischen Schulen in Athen, p. 8 (Berlin, 1843). The Academy was consecrated to Athênê; there was, however, a statue of Eros there, to whom sacrifice was offered, in conjunction with Athênê. Athenæus, xiii. 561.
At the time when Aristophanes assailed Sokrates in the comedy of the Nubes (423 B.C.), the Academy was known and familiar as a place for gymnastic exercise; and Aristophanes (Nub. 995) singles it out as the proper scene of action for the honest and muscular youth, who despises rhetoric and philosophy. Aristophanes did not anticipate that within a short time after the representation of his last comedy, the most illustrious disciple of Sokrates would select the Academy as the spot for his residence and philosophical lectures, and would confer upon the name a permanent intellectual meaning, as designating the earliest and most memorable of the Hellenic schools.
In 369 B.C., when the school of Plato was in existence, the Athenian hoplites, marching to aid the Lacedæmonians in Peloponnesus, were ordered by Iphikrates to make their evening meal in the Academy (Xen. Hell. vi. 5, 49).
The garden, afterwards established by Epikurus, was situated between the gate of Athens and the Academy: so that a person passed by it, when he walked forth from Athens to the Academy (Cic. De Fin. i. 1).
Plato as a teacher — pupils numerous and wealthy, from different cities.
We have scarce any particulars respecting the growth of the Academy from this time to the death of Plato, in 347 B.C. We only know generally that his fame as a lecturer became eminent and widely diffused: that among his numerous pupils were included Speusippus, Xenokrates, Aristotle, Demosthenes, Hyperides, Lykurgus, &c.: that he was admired and consulted by Perdikkas in Macedonia and Dionysius at Syracuse: that he was also visited by listeners and pupils from all parts of Greece. Among them was Eudoxus of Knidus, who afterwards became illustrious both in geometry and astronomy. At the age of twenty-three, and in poor circumstances, Eudoxus was tempted by the reputation of the Sokratic men, and enabled by the aid of friends, to visit Athens: where, however, he was coldly received by Plato. Besides preparing an octennial period or octaetêris, and a descriptive map of the Heavens, Eudoxus also devised the astronomical hypothesis of Concentric Spheres — the earliest theory proposed to show that the apparent irregularity in the motion of the Sun and the Planets might be explained, and proved to result from a multiplicity of co-operating spheres or agencies, each in itself regular.[24] This theory of Eudoxus is said to have originated in a challenge of Plato, who propounded to astronomers, in his oral discourse, the problem which they ought to try to solve.[25]
[24] For an account of Eudoxus himself, of his theory of concentric spheres, and the subsequent extensions of it, see the instructive volume of the late lamented Sir George Cornewall Lewis, — Historical Survey of the Ancient Astronomy, ch. iii. sect. 3, p. 146 seq.