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11Some springs are exceedingly bitter, from the bitterness of the juices of the earth; as the river Hypanis in Pontus, which, for the first forty miles from its source, is of very sweet flavour; but at a spot one hundred and sixty miles from its mouth, a very small spring falls into it, after which the whole body of the river becomes bitter; and this because the water flows through that sort of earth and veins from whence red lead is procured.
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