It can, however, be proved true only in those cases in which the ancient state of the progenitor of the group has not been wholly obliterated, either by successive variations having supervened at a very early period of growth, or by such variations having been inherited at an earlier age than that at which they first appeared.
Baina kasu hauexetan ez bestetan egiaztatu ahal izanen da: taldearen gurasolehenaren antzinako egoera erabat ezabatu ez denean, dela hurrenez hurreneko eraldaketak hazkunde-aldi oso goiztiarrean gertatu direlako, dela eraldaketok lehenbizikoz agertu ziren baino adin goiztiarragoan heredatu direlako.