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 'Tis frivolous to fix pedantically the date of particular inventions. They have all been invented over and over fifty times. Man is the arch machine, of which all these shifts drawn from himself are toy models. He helps himself on each emergency by copying or duplicating his own structure, just so far as the need is. 'Tis hard to find the right Homer, Zoroaster, or Menu; harder still to find the Tubal Cain, or Vulcan, or Cadmus, or Copernicus, or Fust, or Fulton, the indisputable inventor. There are scores and centuries of them. "The air is full of men." This kind of talent so abounds, this constructive tool-making efficiency, as if it adhered to the chemic atoms, as if the air he breathes were made of Vaucansons, Franklins, and Watts.

Doubtless, in every million there will be an astronomer, a mathematician, a comic poet, a mystic. No one can read the history of astronomy, without perceiving that Copernicus, Newton, Laplace, are not new men, or a new kind of men, but that Thales, Anaximenes, Hipparchus, Empedocles, Aristarchus, Pythagoras, Œnopides, had anticipated them; each had the same tense geometrical brain, apt for the same vigorous computation and