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. Seventh Thousand (Corrected). Cr. 8vo, Seventh Thousand; pp. [ii], viii, 328, (adv.); 15 text illustrations, index; original cloth; uncut; (inscription on title-page & long inscription on first blank); a very good copy; scarce. London; John Murray; 1882.