and the varieties would at first be local or confined to one place, but if possessed of any decided advantage, or when further modified and improved, they would slowly spread and supplant their parent-forms.
baina abantaila erabakiorren baten jabe izanez gero, eta areago aldatu edo hobetuz gero, poliki-poliki sakabanatu eta beren guraso-formak ordezkatuko lituzkete.