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
Thickness of mould in inches.
4. Summit of field, trench 45 40
inches deep
5. Close to summit of field, 26
trench 36 inches deep
6. Close to summit of field, 28
trench 28 inches deep
7. Near summit of field, trench 24
36 inches deep
8. Near summit of field, trench 24
at one end 39 inches deep; the
mould here graduated into the
underlying undisturbed sand, and
its thickness (24 inches) is
somewhat arbitrary. At the other
end of the trench, a causeway was
encountered at a depth of only 7
inches, and the mould was here
only 7 inches thick
9. Trench close to the last, 28 24
inches in depth
10. Lower part of same field, 15
trench 30 inches deep
11. Lower part of same field, 17
trench 31 inches deep
12. Lower part of same field, 28
trench 36 inches deep, at which
depth undisturbed sand was
reached
13. In another part of same 9½
field, trench 9½ inches deep
stopped by concrete
14. In another part of same 9
field, trench 9 inches deep,
stopped by concrete
15. In another part of the same 16
field, trench 24 inches deep,
when sand was reached
16. In another part of same 13
field, trench 30 inches deep,
when stones were reached; at one
end of the trench mould 12
inches, at the other end 14
inches thick
Small field between “Old Works” and “Shop Leasows,” I believe nearly as
high as the upper part of the latter field.
Thickness of mould in inches.
17. Trench 26 inches deep 24
18. Trench 10 inches deep, and 10
then came upon a causeway
19. Trench 34 inches deep 30
20. Trench 31 inches deep 31
Field on the western side of the space enclosed within the old walls.
Thickness of mould in inches.
21. Trench 28 inches deep, when 16
undisturbed sand was reached
22. Trench 29 inches deep, when 15
undisturbed sand was reached
23. Trench 14 inches deep, and 14
then came upon a building
Public-domain text, read in full here on John Shaqi.
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