 Evolution was listed for the first time, in the wake of Charles Darwin's writings, but the subject was treated as if still controversial, and a complete working of the subject would have to wait for the 11th edition.The 8th edition has no listing for the subject at all.Compared to the 8th edition, the 9th was far more luxurious, with thick boards and high-quality leather bindings, premier paper, and a production which took full advantage of the technological advances in printing in the years between the 1850s and 1870s.