This view of the relation of the species of one region to those of another, does not differ much from that advanced by Mr. Wallace, who concludes that "every species has come into existence coincident both in space and time with a pre-existing closely allied species." And it is now well known that he attributes this coincidence to descent with modification.
Eskualde bateko espezieak beste batekoekin erlazionaturik daudela dioen eritzi honek ez du alde handirik Wallacek proposaturikotik, hark ondorio hauxe ateratzen baitu: "espezie oro, aurretik existitzen zen beste espezie hurbil-hurbil batekin denbora eta espazio berean batera izanez hasi da existitzen". Eta orain ongi jakina da batera izate hau eraldaketadun ondorengotzari iratxekitzen diola.