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. With illustrations. Ninth Thousand (Corrected). Cr. 8vo, Ninth Thousand; pp. [ii], viii, 328, (adv.); 15 text illustrations, index; original cloth (slightly flecked; neatly recased, with new endpapers); uncut; a very good copy; scarce. London; John Murray; 1883.