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WHAT WORMS DO
(FROM THE FORMATION OF VEGETABLE MOULD.)
BY CHARLES DARWIN.
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We now come to treat of a curious and important subject,-namely, the amount of earth which is brought up by worms from beneath the surface, and is afterwards spread out more or less completely by the rain and wind.
The amount can be judged of by two methods,-by the rate at which objects left on the surface are buried, and more accurately by weighing the quantity brought up within a given time. We will begin with the first method, as it was first followed.
Near Maer Hall in Staffordshire, quick-lime had been spread, about the year 1827, thickly over a field of good pasture-land, which had not since been ploughed.
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