These individual differences are of the highest importance for us, for they are often inherited, as must be familiar to every one; and they thus afford materials for natural selection to act on and accumulate, in the same manner as man accumulates in any given direction individual differences in his domesticated productions.
Alde indibidual hauek garrantzirik handiena dute guretzat; izan ere, maiz, askok ongi jakin bide duen bezala, heredatuak dira, eta horrela, materialak eskaintzen dituzte hautespen naturalak berengan joka eta meta ditzan, gizakumeak bere etxe-ekoizkinen ezberdintasun indibidualak norabide jakin batean metatzen dituen bezala.