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. Cr. 8vo, First U.S. Edition; pp. [iv], viii, 326, (blank); 15 text illustrations, index; original cloth (worn; a very good ex-library copy with label to endpaper, blind stamp to title-page & label on verso, otherwise internally clean); scarce. New York; D. Appleton & Company; 1882.