Hence an oceanic island at first sight seems to have been highly favourable for the production of new species. But we may thus deceive ourselves, for to ascertain whether a small isolated area, or a large open area like a continent, has been most favourable for the production of new organic forms, we ought to make the comparison within equal times;
izan ere, forma organiko berriak sortzeko zein izan den egokiagoa, herrialde txiki isolatu bat ala kontinente bat bezalako herrialde handi zabal bat erabakitzeko, konparazioa denboraldi berean egin beharko genuke eta hori egiterik ez dugu.