Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. . s form of contention withthe efflux of the natural world, and mustrecount the struggle of man, becomingever more arduous, to maintain himselfand his kind upon the surface of a globesinking into the rigors of an endlesswinter. From the middle epoch, mostfavorable to the production and longev-ity of man as an animal to the end ofhis career, he will be put at a disadvan-tage, and will cease to develop under thelaws o
Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. . s form of contention withthe efflux of the natural world, and mustrecount the struggle of man, becomingever more arduous, to maintain himselfand his kind upon the surface of a globesinking into the rigors of an endlesswinter. From the middle epoch, mostfavorable to the production and longev-ity of man as an animal to the end ofhis career, he will be put at a disadvan-tage, and will cease to develop under thelaws of his environment. Up to thattime—the crisis—when the accretion andthe expenditure of heat are equal, ourrace development will continue. Thephysical, intellectual, and let us hopethe moral, powers of man will continueto expand and develop. But after thecrisis we may expect to wane—slowlywe may believe; but the cosmic lawmust doubtless be obeyed. Philosophy and astronomy have com-bined their resources in the attempt todetermine the present condition of ourheat equation and the relations of man-life thereto. The best scientific opinionhas been brought to bear on the ques-. CONDITION OF EXTREME HEAT, ILLUSTRATED FROM AFRICAN FOREST.—Drawn by Alexandre de Bar. TIME OF THE BEGINNING.—ASTRONOMICAL ARGUMENT. 79 tion, and the decision is that our planethas not readied, by a considerable span,Condition of the maximum of its vital-heat equation -^ considered as the arena with respect to J man-life. 0f our race activities. This is to say that the world is still receivingat the surface an increment of heat morethan equal to the constant waste in itsprogress through space. The excess isnot by any means so great as it was in theprevious history of the planet; but as weapproach the crisis—our epoch of equi-librium between the heat given and re-ceived—the approach thereto is retardedby many favoring circumstances, thusprolonging the period of human develop-ment. While the amount
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Keywords: ., bookcentury1800, bookdecade1890, booksub, booksubjectworldhistory
