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The formation of vegetable mould through the action of worms, with observations on their habits

The formation of vegetable mould through the action of worms, with observations on their habits

By Charles Darwin Nature 01/01/1882

Nature of the sites inhabited — Can live long under water — Nocturnal — Wander about at night — Often lie close to the mouths of their burrows, and are thus destroyed in large numbers by birds — Structure — Do not possess eyes, but can distinguish between light and darkness — Retreat rapidly when brightly illuminated, not by a reflex action — Power of attention — Sensitive to heat and cold — Completely dtaf — Sensitive to vibrations and to touch — Feeble power of smell — Taste — Mental qualities — Nature of food — Omnivorous — Digestion — Leaves before being swallowed, moistened with a fluid of the nature of the pancreatic secretion — Extra-stomachal digestion - Calciferous glands, structure of — Cal- careous concretions formed in the anterior pair of glands — The calcareous matter primarily an excretion, but secondarily serves to neutralise the acids generated during the digestive process.

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