If species be only well-marked and permanent varieties, we can at once see why their crossed offspring should follow the same complex laws in their degrees and kinds of resemblance to their parents-in being absorbed into each other by successive crosses, and in other such points-as do the crossed offspring of acknowledged varieties.
Instintuak aldaki ongi markatu eta iraunkorrak badira, behingoan ikus dezakegu haien gurutzaketatik sorturiko ondorengoek zergatik segitu behar dieten aldaki ezagunen gurutzaketatik sorturiko ondorengoek segitzen dieten lege konplexu berberei, gurasoekiko duten antz gradu eta motetan, hurrenez hurreneko gurutzaketez elkar absorbiturik geratzean eta antzekoetan.