Keywords: Darwin, Earthworm, Fig. 1.JPG en Diagram of the alimentary canal of an earthworm Lumbricus de Zeichnung des Darmkanals eines Regenwurms Lumbricus Charles Darwin The formation of vegetable mould through the action of worms with observations of their habits London John Murray 1881 Ray Lancester 1881 PD-old The Formation of Vegetable Mould through the Action of Worms |