DARWIN ON HUMUS AND THE EARTHWORM: THE FORMATION OF VEGETABLE MOULD through the Action of Worms with Observations on their Habits.

8vo., brown clothbound hardback gilt; 153pp, indexed, illus in b/w. Clean copy with no previous ownership inscriptions or annotation. Small label remains to rear pastedown, occasional handling marks, slight wear and a few marks to covers, spine slightly faded. Overall a Good+ copy.