Darwin, Charles. THE FORMATION OF VEGETABLE MOULD through the Action of Worms, with Observations on their Habits. By Charles Darwin, LL.D., F.R.S. Thirteenth Thousand. With illustrations. Cr. 8vo; pp. viii, 298, (adv., verso blank); 15 illustrations on 10 plates, index; original cloth (slightly marked; some foxing); spine and front board lettered in black; a nice copy in slightly defective dustwrapper. London; John Murray; 1904.