Any one who will read Sylla’s myth, with a good map of the moon’s surface before him, will be able to locate for himself the ‘Gulf of Hecate’, and the long valleys leading to the Elysian plains, which, on her side remote from earth, enjoy diffused sunlight. There need be no idea of shafts or tunnels driven through the solid body of the moon. Cicero’s _Dream of Scipio_, written more than a century before Plutarch’s Dialogue, and also drawn from Posidonius, will be found an admirable companion piece, enforcing, in language of singular beauty and elevation, those duties to country and ancestors which find inadequate expression in the Greek thought of the first century of our era. NOTE ON THE PLURALITY OF WORLDS AND THE FIVE REGULAR SOLIDS The opinion that our World, or universe, is not the only one in the Whole, is attributed, in general terms, to many of the early Greek philosophers, notably to Anaximander. The exact meaning of a ‘Cosmos’, in this connexion, is perhaps not easy to fix. Aristotle is clear that the circle of the fixed stars is one and constant, but the author of the Stoical treatise on the Cosmos, found among his works, takes stars to be a part of the (one) Cosmos. An earth, such as ours with her atmosphere and moon, is essential, and a sun, or access to sunlight, and perhaps some planets. In the _Dream of Scipio_ our solar system, with the earth in its centre, is described with great distinctness as a unit in space. The planets are always regarded as luminous points, stars somewhat out of place (see p. 268), possessing no definite magnitude or solid substance.