a history of science-1-第59章
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at has become famous as the episode of The Thundering Legion。 Xiphilinus has preserved the account of Dion； adding certain picturesque interpretations of his own。 The original narrative； as cited； asserts that during one of the northern campaigns of Marcus Aurelius； the emperor and his army were surrounded by the hostile Quadi； who had every advantage of position and who presently ceased hostilities in the hope that heat and thirst would deliver their adversaries into their hands without the trouble of further fighting。 〃Now；〃 says Dion； 〃while the Romans； unable either to combat or to retreat； and reduced to the last extremity by wounds； fatigue； heat； and thirst； were standing helplessly at their posts； clouds suddenly gathered in great number and rain descended in floodscertainly not without divine intervention； since the Egyptian Maege Arnulphis； who was with Marcus Antoninus； is said to have invoked several genii by the aerial mercury by enchantment； and thus through them had brought down rain。〃 Here； it will be observed； a supernatural explanation is given of a natural phenomenon。 But the narrator does not stop with this。 If we are to accept the account of Xiphilinus； Dion brings forward some striking proofs of divine interference。 Xiphilinus gives these proofs in the following remarkable paragraph： 〃Dion adds that when the rain began to fall every soldier lifted his head towards heaven to receive the water in his mouth； but afterwards others hold out their shields or their helmets to catch the water for themselves and for their horses。 Being set upon by the barbarians 。 。 。 while occupied in drinking； they would have been seriously incommoded had not heavy hail and numerous thunderbolts thrown consternation into the ranks of the enemy。 Fire and water were seen to mingle as they left the heavens。 The fire； however； did not reach the Romans； but if it did by chance touch one of them it was immediately extinguished； while at the same time the rain； instead of comforting the barbarians； seemed merely to excite like oil the fire with which they were being consumed。 Some barbarians inflicted wounds upon themselves as though their blood had power to extinguish flames； while many rushed over to the side of the Romans； hoping that there water might save them。〃 We cannot better complete these illustrations of pagan credulity than by adding the comment of Xiphilinus himself。 That writer was a Christian； living some generations later than Dion。 He never thought of questioning the facts； but he felt that Dion's interpretation of these facts must not go unchallenged。 As he interprets the matter； it was no pagan magician that wrought the miracle。 He even inclines to the belief that Dion himself was aware that Christian interference； and not that of an Egyptian； saved the day。 〃Dion knew；〃 he declares； 〃that there existed a legion called The Thundering Legion； which name was given it for no other reason than for what came to pass in this war；〃 and that this legion was composed of soldiers from Militene who were all professed Christians。 〃During the battle；〃 continues Xiphilinus； 〃the chief of the Pretonians ； had set at Marcus Antoninus； who was in great perplexity at the turn events were taking； representing to him that there was nothing the people called Christians could not obtain by their prayers； and that among his forces was a troop composed wholly of followers of that religion。 Rejoiced at this news； Marcus Antoninus demanded of these soldiers that they should pray to their god； who granted their petition on the instant； sent lightning among the enemy and consoled the Romans with rain。 Struck by this wonderful success； the emperor honored the Christians in an edict and named their legion The Thundering。 It is even asserted that a letter existed by Marcus Antoninus on this subject。 The pagans well knew that the company was called The Thunderers； having attested the fact themselves； but they revealed nothing of the occasion on which the leader received the name。〃＇1＇ Peculiar interest attaches to this narrative as illustrating both credulousness as to matters of fact and pseudo…scientific explanation of alleged facts。 The modern interpreter may suppose that a violent thunderstorm came up during the course of a battle between the Romans and the so…called barbarians； and that owing to the local character of the storm； or a chance discharge of lightning； the barbarians suffered more than their opponents。 We may well question whether the philosophical emperor himself put any other interpretation than this upon the incident。 But； on the other hand； we need not doubt that the major part of his soldiers would very readily accept such an explanation as that given by Dion Cassius； just as most readers of a few centuries later would accept the explanation of Xiphilinus。 It is well to bear this thought in mind in considering the static period of science upon which we are entering。 We shall perhaps best understand this period； and its seeming retrogressions； if we suppose that the average man of the Middle Ages was no more credulous； no more superstitious； than the average Roman of an earlier period or than the average Greek； though the precise complexion of his credulity had changed under the influence of Oriental ideas； as we have just seen illustrated by the narrative of Xiphilinus。
APPENDIX REFERENCE LIST； NOTES； AND BIBLIOGRAPHIES
CHAPTER I。 PREHISTORIC SCIENCE Length of the Prehistoric Period。It is of course quite impossible to reduce the prehistoric period to any definite number of years。 There are； however； numerous bits of evidence that enable an anthropologist to make rough estimates as to the relative lengths of the different periods into which prehistoric time is divided。 Gabriel de Mortillet； one of the most industrious students of prehistoric archaeology； ventured to give a tentative estimate as to the numbers of years involved in each period。 He of course claimed for this nothing more than the value of a scientific guess。 It is； however； a guess based on a very careful study of all data at present available。 Mortillet divides the prehistoric period； as a whole； into four epochs。 The first of these is the preglacial； which he estimates as comprising seventy…eight thousand years； the second is the glacial； covering one hundred thousand years； then follows what he terms the Solutreen； which numbers eleven thousand years； and； finally； the Magdalenien； comprising thirty…three thousand years。 This gives； for the prehistoric period proper； a term of about two hundred and twenty…two thousand years。 Add to this perhaps twelve thousand years ushering in the civilization of Egypt； and the six thousand years of stable； sure chronology of the historical period； and we have something like two hundred and thirty thousand or two hundred and forty thousand years as the age of man。 〃These figures；〃 says Mortillet； 〃are certainly not exaggerated。 It is even probable that they are below the truth。 Constantly new discoveries are being made that tend to remove farther back the date of man's appearance。〃 We see； then； according to this estimate； that about a quarter of a million years have elapsed since man evolved to a state that could properly be called human。 This guess is as good as another； and it may advantageously be kept in mind； as it will enable us all along to understand better than we might otherwise be able to do the tremendous force of certain prejudices and preconceptions which recent man inherited from his prehistoric ancestor。 Ideas which had passed current as unquestioned truths for one hundred thousand years or so are not easily cast aside。 In going back； in imagination； to the beginning of the prehistoric period； we must of course reflect； in accordance with modern ideas on the subject； that there was no year； no millennium even； when it could be said expressly： 〃This being was hitherto a primate； he is now a man。〃 The transition period must have been enormously long； and the changes from generation to generation； even from century to century； must have been very slight。 In speaking of the extent of the age of man this must be borne in mind： it must be recalled that； even if the period were not vague for other reasons； the vagueness
