But in the case of an island, or of a country partly surrounded by barriers, into which new and better adapted forms could not freely enter, we should then have places in the economy of nature which would assuredly be better filled up if some of the original inhabitants were in some manner modified;
Baina irla edo zati batean barreraz inguraturiko herrialde baten kasuan, bertara forma berri eta hobeto egokituek sartzen erraz ez luketelarik, orduan naturaren ekonomian hobeto beterik egonen liratekeen lekuak izanen genituzke ziur, baldin hango jatorrizko biztanleetako batzuk nolabait aldatuko balira;