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THE AMOUNT OF FINE EARTH BROUGHT UP BY WORMS TO THE SURFACE.

now come to the more immediate subject of this volume, 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