Review Article

Charles Darwin's Observations on the Behaviour of Earthworms and the Evolutionary History of a Giant Endemic Species from Germany, Lumbricus badensis (Oligochaeta: Lumbricidae)

Figure 3

Cross section of the vegetable mould in a field, drained and reclaimed fifteen years previously. (a) Vegetable mould, without stones, (b) Mould with fragments of burnt marl, coal-cinders and quartz pebbles, (c) Subsoil of black, peaty sand with quartz pebbles (adapted from Darwin 1881 [2]).
823047.fig.003