In the chapter on geological succession I attempted to show, on the principle of each group having generally diverged much in character during the long-continued process of modification, how it is that the more ancient forms of life often present characters in some degree intermediate between existing groups.
Hurrenketa Geologikoari buruzko kapituluan saiatu nintzen frogatzen, eraldatze-prozesu luzean zehar talde bakoitza bere ezaugarrietan eskuarki enborretik asko aldendu dela dioen hastapenean oinarrituz, bizi-formarik zaharrenek, maiz, bizirik dirauten taldeen bitarteko ezaugarriak izaten dituztela.