Now such differences are intelligible, and might even have been expected, on the supposition that species belonging to distinct families had slowly become adapted to live more and more out of water, and to breathe the air.
Orain, ezberdintasunok ulergarriak dira, eta espero izatekoak ere baziren, familia diferenteetako espezieak astiro-astiro uretatik kanpo bizitzera, eta airea arnastera, gero eta moldatuago gertatu direla suposatuz gero;