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, Thirteenth Thousand; pp. [ii], viii, 328, (blank); 15 text illustrations, index; uncut in the original cloth (flecked & a little marked; a few tears neatly repaired); a very good copy; scarce. London; John Murray; 1897.