The enmity to the sea is another Spartan feature which is transferred by Plato to the Magnesian state.  He did not reflect that a non-maritime power would always be at the mercy of one which had a command of the great highway.  Their many island homes, the vast extent of coast which had to be protected by them, their struggles first of all with the Phoenicians and Carthaginians, and secondly with the Persian fleets, forced the Greeks, mostly against their will, to devote themselves to the sea.  The islanders before the inhabitants of the continent, the maritime cities before the inland, the Corinthians and Athenians before the Spartans, were compelled to fit out ships:  last of all the Spartans, by the pressure of the Peloponnesian War, were driven to establish a naval force, which, after the battle of Aegospotami, for more than a generation commanded the Aegean.  Plato, like the Spartans, had a prejudice against a navy, because he regarded it as the nursery of democracy.  But he either never considered, or did not care to explain, how a city, set upon an island and ’distant not more than ten miles from the sea, having a seaboard provided with excellent harbours,’ could have safely subsisted without one.

Neither the Spartans nor the Magnesian colonists were permitted to engage in trade or commerce.  In order to limit their dealings as far as possible to their own country, they had a separate coinage; the Magnesians were only allowed to use the common currency of Hellas when they travelled abroad, which they were forbidden to do unless they received permission from the government.  Like the Spartans, Plato was afraid of the evils which might be introduced into his state by intercourse with foreigners; but he also shrinks from the utter exclusiveness of Sparta, and is not unwilling to allow visitors of a suitable age and rank to come from other states to his own, as he also allows citizens of his own state to go to foreign countries and bring back a report of them.  Such international communication seemed to him both honourable and useful.

We may now notice some points in which the commonwealth of the Laws approximates to the Athenian model.  These are much more numerous than the previous class of resemblances; we are better able to compare the laws of Plato with those of Athens, because a good deal more is known to us of Athens than of Sparta.

The information which we possess about Athenian law, though comparatively fuller, is still fragmentary.  The sources from which our knowledge is derived are chiefly the following:—­

(1) The Orators,—­Antiphon, Andocides, Lysias, Isocrates, Demosthenes, Aeschines, Lycurgus, and others.

(2) Herodotus, Thucydides, Xenophon, Plato, Aristotle, as well as later writers, such as Cicero de Legibus, Plutarch, Aelian, Pausanias.

(3) Lexicographers, such as Harpocration, Pollux, Hesychius, Suidas, and the compiler of the Etymologicum Magnum, many of whom are of uncertain date, and to a great extent based upon one another.  Their writings extend altogether over more than eight hundred years, from the second to the tenth century.