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 be square at the Sides, as the Book is; but when I hold this Orange in the same Light, the Shadow, you see, hath a round Edge; and therefore since in the Eclipses of the Moon, the Shadow of the Earth, which you know, Madam, occasions the Moon's being covered with Darkness, appearing always exactly round or circular, we justly conclude that the Figure of the Earth is round or spherical too, or else the Termination or Out-Line of its Shadow could never be always in a Circular Form.

you for this easy and natural Explication, said the Lady, which I think I comprehend; and I am beholding to the Sun, that great Fountain of Light, or rather to Him that made it, for being now instrumental to dispel the Darkness I had in my Mind before about this Affair; however, being no Persian, I shall not worship the Sun for it. But pray, Sir, go on with an Explication of the other Globe.

, Madam, is called the Celestial one, said I, because 'tis designed for a Representation of the Firmament, and the Concave Arch of the Heavens; and indeed it doth well enough exhibit to us the fixed Stars, and the Tracks or Circles of