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While he was still speaking Demetrius, interrupting him, said, How is it, Cleombrotus, that you can say that the year has been called a generation? For neither of a man in his vigour nor in his eld, as some read the passage, is the span of human life such as this. Those who read in their vigour make a generation thirty years, in accord with Heracleitus, Cf. Diels, Frag. der Vorsokratiker, i. p. 76, Heracleitus, no. a 19. a time sufficient for a father to have a son who is a father also; but again those who write in their eld and not in their vigour assign an hundred and eight years to a generation; for they say that fifty-four marks the limit of the middle years of human life, a number which is made up of the first number, the first two plane surfaces, two squares and two cubes,That is 1 + (1x2) + (1x3) + 4 + 9 + 8 + 27 = 54. numbers which Plato also took in his Generation of the Soul. Cf. Plato, Timaeus, 34 c - 35 a. The whole matter as stated by Hesiod seems to contain a veiled reference to the Conflagration, when the disappearance of all liquids will most likely be accompanied by the extinction of the Nymphs, Who in the midst of fair woodlands, Sources of rivers, and grass-covered meadows have their abiding.Homer, Il. xx. 8-9.