We can see why there should be so striking a parallelism in the distribution of organic beings throughout space, and in their geological succession throughout time; for in both cases the beings have been connected by the bond of ordinary generation, and the means of modification have been the same.
Ulertu ahal izanen dugu zergatik egon behar duen hain paralelismo nabarmena izaki organikoen banakuntzan espazioan zehar eta haien hurrenketa geologikoan denboran zehar, izan ere, kasu biotan izakiak sorketa arruntaren lokarriaz loturik egon baitira, eta aldatzeko bitarteko berberak izan baitituzte.