a history of science-1-第28章
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n watery halls； and beasts whose lair is in the mountains； and birds borne on wings。〃＇17＇ All this is poetry rather than science； yet such imaginings could come only to one who was groping towards what we moderns should term an evolutionary conception of the origins of organic life； and however grotesque some of these expressions may appear； it must be admitted that the morphological ideas of Empedocles； as above quoted； give the Sicilian philosopher a secure place among the anticipators of the modern evolutionist。
VII。 GREEK SCIENCE IN THE EARLY ATTIC PERIOD We have travelled rather far in our study of Greek science； and yet we have not until now come to Greece itself。 And even now； the men whose names we are to consider were； for the most part； born in out… lying portions of the empire； they differed from the others we have considered only in the fact that they were drawn presently to the capital。 The change is due to a most interesting sequence of historical events。 In the day when Thales and his immediate successors taught in Miletus； when the great men of the Italic school were in their prime； there was no single undisputed Centre of Greek influence。 The Greeks were a disorganized company of petty nations； welded together chiefly by unity of speech； but now； early in the fifth century B。C。； occurred that famous attack upon the Western world by the Persians under Darius and his son and successor Xerxes。 A few months of battling determined the fate of the Western world。 The Orientals were hurled back； the glorious memories of Marathon； Salamis； and Plataea stimulated the patriotism and enthusiasm of all children of the Greek race。 The Greeks； for the first time； occupied the centre of the historical stage； for the brief interval of about half a century the different Grecian principalities lived together in relative harmony。 One city was recognized as the metropolis of the loosely bound empire； one city became the home of culture and the Mecca towards which all eyes turned； that city； of course； was Athens。 For a brief time all roads led to Athens； as； at a later date； they all led to Rome。 The waterways which alone bound the widely scattered parts of Hellas into a united whole led out from Athens and back to Athens； as the spokes of a wheel to its hub。 Athens was the commercial centre； and； largely for that reason； it became the centre of culture and intellectual influence also。 The wise men from the colonies visited the metropolis； and the wise Athenians went out to the colonies。 Whoever aspired to become a leader in politics； in art； in literature； or in philosophy； made his way to the capital； and so； with almost bewildering suddenness； there blossomed the civilization of the age of Pericles； the civilization which produced aeschylus； Sophocles； Euripides； Herodotus； and Thucydides； the civilization which made possible the building of the Parthenon。
ANAXAGORAS Sometime during the early part of this golden age there came to Athens a middle…aged man from Clazomenae； who； from our present stand…point； was a more interesting personality than perhaps any other in the great galaxy of remarkable men assembled there。 The name of this new…comer was Anaxagoras。 It was said in after…time； we know not with what degree of truth； that he had been a pupil of Anaximenes。 If so； he was a pupil who departed far from the teachings of his master。 What we know for certain is that Anaxagoras was a truly original thinker； and that he became a close friendin a sense the teacherof Pericles and of Euripides。 Just how long he remained at Athens is not certain； but the time came when he had made himself in some way objectionable to the Athenian populace through his teachings。 Filled with the spirit of the investigator； he could not accept the current conceptions as to the gods。 He was a sceptic； an innovator。 Such men are never welcome； they are the chief factors in the progress of thought； but they must look always to posterity for recognition of their worth； from their contemporaries they receive； not thanks； but persecution。 Sometimes this persecution takes one form； sometimes another； to the credit of the Greeks be it said； that with them it usually led to nothing more severe than banishment。 In the case of Anaxagoras； it is alleged that the sentence pronounced was death； but that； thanks to the influence of Pericles； this sentence was commuted to banishment。 In any event； the aged philosopher was sent away from the city of his adoption。 He retired to Lampsacus。 〃It is not I that have lost the Athenians；〃 he said； 〃it is the Athenians that have lost me。〃 The exact position which Anaxagoras had among his contemporaries； and his exact place in the development of philosophy； have always been somewhat in dispute。 It is not known； of a certainty； that he even held an open school at Athens。 Ritter thinks it doubtful that he did。 It was his fate to be misunderstood； or underestimated； by Aristotle； that in itself would have sufficed greatly to dim his famemight； indeed； have led to his almost entire neglect had he not been a truly remarkable thinker。 With most of the questions that have exercised the commentators we have but scant concern。 Following Aristotle； most historians of philosophy have been metaphysicians； they have concerned themselves far less with what the ancient thinkers really knew than with what they thought。 A chance using of a verbal quibble； an esoteric phrase； the expression of a vague mysticismthese would suffice to call forth reams of exposition。 It has been the favorite pastime of historians to weave their own anachronistic theories upon the scanty woof of the half… remembered thoughts of the ancient philosophers。 To make such cloth of the imagination as this is an alluring pastime； but one that must not divert us here。 Our point of view reverses that of the philosophers。 We are chiefly concerned； not with some vague saying of Anaxagoras； but with what he really knew regarding the phenomena of nature； with what he observed； and with the comprehensible deductions that he derived from his observations。 In attempting to answer these inquiries； we are obliged； in part； to take our evidence at second…hand； but； fortunately； some fragments of writings of Anaxagoras have come down to us。 We are told that he wrote only a single book。 It was said even （by Diogenes） that he was the first man that ever wrote a work in prose。 The latter statement would not bear too close an examination； yet it is true that no extensive prose compositions of an earlier day than this have been preserved； though numerous others are known by their fragments。 Herodotus； 〃the father of prose；〃 was a slightly younger contemporary of the Clazomenaean philosopher； not unlikely the two men may have met at Athens。 Notwithstanding the loss of the greater part of the writings of Anaxagoras； however； a tolerably precise account of his scientific doctrines is accessible。 Diogenes Laertius expresses some of them in very clear and precise terms。 We have already pointed out the uncertainty that attaches to such evidence as this； but it is as valid for Anaxagoras as for another。 If we reject such evidence； we shall often have almost nothing left； in accepting it we may at least feel certain that we are viewing the thinker as his contemporaries and immediate successors viewed him。 Following Diogenes； then； we shall find some remarkable scientific opinions ascribed to Anaxagoras。 〃He asserted；〃 we are told； 〃that the sun was a mass of burning iron； greater than Peloponnesus； and that the moon contained houses and also hills and ravines。〃 In corroboration of this； Plato represents him as having conjectured the right explanation of the moon's light； and of the solar and lunar eclipses。 He had other astronomical theories that were more fanciful； thus 〃he said that the stars originally moved about in irregular confusion； so that at first the pole…star； which is continually visible； always appeared in the zenith； but that afterwards it acquired a certain declination； and that the Milky Way was a reflection of the light of the sun when the stars did not appear。 The comets he considered to be a concourse of planets emitting rays； and the shooting… stars he thought were sparks； as it wer
