The Formation of Vegetable Mould Through the Action of Worms: With Observations on Their HabitsDarwin, Charles
Science
The Formation of Vegetable Mould Through the Action of Worms: With Observations on Their Habits
Darwin, Charles
Earthworms; Humification; Soils
Beaulieu Abbey, Hampshire.—This abbey was destroyed by Henry VIII., and
there now remains only a portion of the southern aisle-wall. It is
believed that the king had most of the stones carried away for building a
castle; and it is certain that they have been removed. The positions of
the nave and transepts were ascertained not long ago by the foundations
having been found; and the place is now marked by stones let into the
ground. Where the abbey formerly stood, there now extends a smooth
grass-covered surface, which resembles in all respects the rest of the
field. The guardian, a very old man, said the surface had never been
levelled in his time. In the year 1853, the Duke of Buccleuch had three
holes dug in the turf within a few yards of one another, at the western
end of the nave; and the old tesselated pavement of the abbey was thus
discovered. These holes were afterwards surrounded by brickwork, and
protected by trap-doors, so that the pavement might be readily inspected
and preserved. When my son William examined the place on January 5,
1872, he found that the pavement in the three holes lay at depths of 6¾,
10 and 11½ inches beneath the surrounding turf-covered surface. The old
guardian asserted that he was often forced to remove worm-castings from
the pavement; and that he had done so about six months before. My son
collected all from one of the holes, the area of which was 5.32 square
feet, and they weighed 7.97 ounces. Assuming that this amount had
accumulated in six months, the accumulation during a year on a square
yard would be 1.68 pounds, which, though a large amount, is very small
compared with what, as we have seen, is often ejected on fields and
commons. When I visited the abbey on June 22, 1877, the old man said
that he had cleared out the holes about a month before, but a good many
castings had since been ejected. I suspect that he imagined that he
swept the pavements oftener than he really did, for the conditions were
in several respects very unfavourable for the accumulation of even a
moderate amount of castings. The tiles are rather large, viz., about 5½
inches square, and the mortar between them was in most places sound, so
that the worms were able to bring up earth from below only at certain
points. The tiles rested on a bed of concrete, and the castings in
consequence consisted in large part (viz., in the proportion of 19 to 33)
of particles of mortar, grains of sand, little fragments of rock, bricks
or tile; and such substances could hardly be agreeable, and certainly not
nutritious, to worms.
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