Fortunately， a student of history had no responsibility for the problem； he took it as science gave it， and waited only to be taught. With science or with society， he had no quarrel and claimed no share of authority. He had never been able to acquire knowledge， still less to impart it； and if he had， at times， felt serious differences with the American of the nineteenth century， he felt none with the American of the twentieth. For this new creation， born since 1900， a historian asked no longer to be teacher or even friend； he asked only to be a pupil， and promised to be docile， for once， even though trodden under foot； for he could see that the new American -- the child of incalculable coal-power， chemical power， electric power， and radiating energy， as well as of new forces yet undetermined -- must be a sort of God compared with any former creation of nature. At the rate of progress since 1800， every American who lived into the year 2000 would know how to control unlimited power. He would think in complexities unimaginable to an earlier mind. He would deal with problems altogether beyond the range of earlier society. To him the nineteenth century would stand on the same plane with the fourth -- equally childlike -- and he would only wonder how both of them， knowing so little， and so weak in force， should have done so much. Perhaps even he might go back， in 1964， to sit with Gibbon on the steps of Ara C渓i.
Meanwhile he was getting education. With that， a teacher who had failed to educate even the generation of 1870， dared not interfere. The new forces would educate. History saw few lessons in the past that would be useful in the future； but one， at least， it did see. The attempt of the American of 1800 to educate the American of 1900 had not often been surpassed for folly； and since 1800 the forces and their complications had increased a thousand times or more. The attempt of the American of 1900 to educate the American of 2000， must be even blinder than that of the Congressman of 1800， except so far as he had learned his ignorance. During a million or two of years， every generation in turn had toiled with endless agony to attain and apply power， all the while betraying the deepest alarm and horror at the power they created. The teacher of 1900， if foolhardy， might stimulate； if foolish， might resist； if intelligent， might balance， as wise and foolish have often tried to do from the beginning； but the forces would continue to educate， and the mind would continue to react. All the teacher could hope was to teach it reaction.
Even there his difficulty was extreme. The most elementary books of science betrayed the inadequacy of old implements of thought. Chapter after chapter closed with phrases such as one never met in older literature：
"The cause of this phenomenon is not understood"； "science no longer ventures to explain causes"； "the first step towards a causal explanation still remains to be taken"； "opinions are very much divided"； "in spite of the contradictions involved"； "science gets on only by adopting different theories， sometimes contradictory." Evidently the new American would need to think in contradictions， and instead of Kant's famous four antinomies， the new universe would know no law that could not be proved by its anti-law.
To educate -- one's self to begin with -- had been the effort of one's life for sixty years； and the difficulties of education had gone on doubling with the coal-output， until the prospect of waiting another ten years， in order to face a seventh doubling of complexities， allured one's imagination but slightly. The law of acceleration was definite， and did not require ten years more study except to show whether it held good. No scheme could be suggested to the new American， and no fault needed to be found， or complaint made； but the next great influx of new forces seemed near at hand， and its style of education promised to be violently coercive. The movement from unity into multiplicity， between 1200 and 1900， was unbroken in sequence， and rapid in acceleration. Prolonged one generation longer， it would require a new social mind. As though thought were common salt in indefinite solution it must enter a new phase subject to new laws. Thus far， since five or ten thousand years， the mind had successfully reacted， and nothing yet proved that it would fail to react -- but it would need to jump.