that the fertility of hybrids is not related to the degree in which they resemble in external appearance either parent; and lastly, that the facility of making a first cross between any two species is not always governed by their systematic affinity or degree of resemblance to each other.
hibridoen ugalkortasuna ez dagoela guraso bat edo bestearekin itxuran duten antzarekin loturik; eta, azkenez, zeinahi bi espezieren artean lehen gurutzaketa egiteko erraztasuna ez duela beti araubidetzen haien ahaidetasun sistematikoak edo bata bestearen antzak.