land there was, and go away acquainted with the mode of XENOPHON measuring it.

'But of learning geometry so far as to reach those unintelligible diagrams he disapproved, for he said he did not see of what use these were, although he was not unacquainted with them. But they were enough, he said, to exhaust a man's lifetime, and hindered him from many other useful branches of learning. d

'He bade them also become acquainted with astronomy, but this also only so far as to be able to know the time of night, or of the month, or of the year, for the sake of travelling, or voyaging, or keeping watch, and to be able to make use of the indications relating to all other things that are to be done either in the night, or in the month, or year, by knowing the different seasons for the works before mentioned. These also, he said, were easy to learn from nocturnal hunters, and pilots, and many others, whose p. 744 business it is to know these things.

'But he strongly dissuaded from learning astronomy to such an extent as to know the bodies which are not in the same orbit, and the planets and comets, and to waste time in investigating their distances from the earth, and their periods, and the causes of them. For he said that in these matters he did not see any benefit, and yet even in these he was not uninstructed. But he said of these also that they were enough to wear out a man's lifetime, and to hinder him from many useful pursuits.

And he wholly dissuaded one from anxiously inquiring in what way the heavenly bodies are each contrived by God; for he b neither thought that these things could be discovered by mankind, nor did he believe that the gods would be pleased with the man who sought to know what they had not been willing to make clear. But he said that the man who troubled himself about these things would be in danger even of going as mad as Anaxagoras was, who prided himself very highly upon explaining the contrivances of the gods.

For when he used to say that fire and the sun were the same, he ignored the fact that though men easily discern the fire, yet c they cannot look upon the sun; and by being exposed to the sunshine they have their complexions darkened, but not so by fire. Also he was ignorant that of plants which spring out of the earth none can make good growth without the light of the sun, while

XENOPHON all perish when heated by fire. And in saying that the sun was a fiery stone he was ignorant also of this fact, that while a stone set in the fire neither shines nor lasts long, the sun continues all the time to be the brightest of all things.

'He also used to bid us learn to count; but here also as in d everything else he bade us guard against useless trouble: yet as far as it was useful he would himself help his companions in examining and discussing all things.'

P. 745

So writes Xenophon in the Memorabilia. And in the Epistle to Aeschines the same author writes as follows concerning Plato, and those who boast of their physiology of the universe:

CHAPTER XII

"THAT the things of the gods are beyond us is manifest to every one; but it is sufficient to worship them to the best of our power. What their nature is it is neither easy to discover nor b lawful to inquire. For it pertains not to slaves to know the nature or conduct of their masters, beyond what their service requires. And what is of most importance, in proportion as we ought to admire one who spends labour upon the interests of mankind, so to those who strive to get fame from many inopportune and vain attempts it brings the more trouble. For when, O Aeschines, has any one ever heard Socrates talking about the heaven, or encouraging any one to learn about geometrical lines for correction of morals? As to music we know that he understood it only by ear; but he was constantly telling them on every occasion what was noble, and what manliness was, and C justice, and other virtues: he used in fact to call the interests of mankind absolute good; and all things else, he used to say, were either impossible to be achieved by men, or were akin to fables, playthings of Sophists in their supercilious discussions. And he did not merely say these things without practising them. But to write of his doings to you who know them, although not likely to be unpleasing, takes time, and I have recorded them elsewhere. When refuted therefore let them cease, or betake themselves to what is reasonable, these men who were not pleased with Socrates, to whose wisdom the god bare witness while he

745 a 1 Pa.-Xenophon, Epistle to Aeschines

was yet alive, and they who put him to death found no expiation XENOPHON in repentance. And so what a noble thing-they fell in love d with Egypt, and the prodigious wisdom of Pythagoras, men whose excess and inconstancy towards Socrates was proved by their love of tyranny, and exchange of frugal living for a table of Sicilian luxury to serve their boundless appetite.'

So speaks Xenophon, with a hint at Plato. But Plato in the Republic relates that concerning gymnastics and music Socrates spake as follows:

CHAPTER XIII

'WHAT then, O Glaucon, would be a learning likely to draw P. 746 the soul from the transient to the real? But while I am speaking PLATO there comes into my mind this point: did we not say surely that these guardians while yet young must be athletes in war? Yes, we said so. The learning then which we are seeking must have this quality in addition to the former. What quality? It must be of some use to men of war. It certainly must, if possible. b They were to be educated, we said before, in gymnastic and music. It was so, said he. And gymnastic, I suppose, since it presides over growth and decay of the body, is concerned with generation and corruption. That is evident. This then cannot be the study for which we are seeking. It cannot. Can then music, so far as we previously discussed it? Nay, said he, that, if you remember, c was the counterpart of gymnastic, as training our guardians by the influences of habit, by harmony imparting not science but a kind of harmoniousness, and by rhythm a rhythmical movement, and as having in its words certain other moral tendencies akin to these, whether the subjects of its discourse were fabulous or partly true; but it contained no instruction tending to such an end as you are now seeking.

'You remind me very correctly, said I; for music certainly contained nothing of the kind. But what can there be of this d character, my excellent Glaucon ? For, I think, we regarded all the arts as mechanical. Of course.'

Then further on he adds:

'We must never let those whom we are to educate attempt any 746 a 1 ibid. gai D d 5 ibid. 530 E

d 4 See Plato, Republic, 404 C

PLATO imperfect form of science that has not reached the point that all . ought to attain, as we were saying just now about astronomy. Or do you not know that they treat harmony also in this way? For while they measure and compare with each other the notes and concords that are merely heard, they labour, like the astronomers, on a useless task.

'Yes, by heaven! said he, and it is ludicrous to see how they P. 747 name certain condensed intervals, and lay their ears on one side, as if trying to catch a note from their neighbours; and some of them say that they can still hear an intermediate sound, and that this is the very smallest interval which should be used in measuring, while others doubt this and say that they now sound alike, and both set their ears before their mind.

'You mean, said I, those good men who are always teasing and torturing the strings, and screwing them up on the pegs. But that the metaphor may not be extended too far about the beats b given by the plectrum, and the assent, and dissent, and petulance of the strings, I drop the metaphor, and say that I do not mean these men, but those others whom we said just now that we would consult about harmony. For they do the same as the astronomers; they investigate the numerical relations in the harmonies which fall upon the ears, but they do not rise to problems, to examine what numbers are harmonious, and what not, and the reason in either case.'

But now let this suffice in the way of preface to our defence that we have not without right judgement c neglected the useless learning of such subjects as these. Let us then make at once a new beginning and examine the mutual contradictions in doctrine of the aforesaid physical philosophers. Now Plutarch has collected together the opinions of all the Platonists and Pythagoreans alike, and of the still earlier physical philosophers as they were called, and again of the more recent Peripatetics, and Stoics, and Epicureans, and written them in a work which he entitled Of the Physical Doctrines approved by Philosophers, from which I shall make the d following quotations:

CHAPTER XIV

'THALES of Miletus, one of the seven sages, declared water to PLUTARCH be the first principle of all things. This man is thought to have been the founder of philosophy, and from him the Ionic sect p.748 derived its name; for it had many successions. After studying philosophy in Egypt he came as an elderly man to Miletus. He says that all things come from water, and are all resolved into water. And he forms his conjecture first from the fact that seed, which is watery, is the first principle of all animal life; thus it is probable that all things have their origin from moisture. His second argument is that all plants derive nourishment and fruitfulness from moisture, and when deprived of it wither away. And the third, that the very fire of the sun, and of the stars, and the world itself are nourished by the evaporations of the waters. For this reason Homer also suggests this notion b concerning water,

"Ocean, which is the origin of all."

This is what Thales says.

'But Anaximander of Miletus says that the first principle of all things is the infinite, for from this all are produced, and into this all pass away; for which reason also infinite worlds are generated, and pass away again into that from which they spring. So he says the reason why the infinite exists is that the subsisting creation may not be deficient in any point. But he also is at c fault in not saying what the infinite is, whether it is air, or water, or earth, or any other corporeal elements; he is wrong therefore in declaring the matter while excluding the efficient cause. For the infinite is nothing else than matter, and matter cannot have an actual existence, unless the efficient cause underlie it.

'Anaximenes of Miletus declared that the air is the first principle of all things, for from this all are produced, and into it they are resolved again. For example, our soul, he says, is air, for it holds us together; and the whole world too is encompassed d by air and breath, and air and breath are used as synonyms.

747 da Plutarch, De Placitis Philosophorum, p. 875 IL. xiv. 346

748 b 3 Hom.