We may, however, infer as probable from the consideration of dimorphic and trimorphic plants, that the sterility of distinct species when crossed and of their hybrid progeny, depends exclusively on the nature of their sexual elements, and not on any difference in their structure or general constitution.
Landare dimorfo eta trimorfoen azterketatik, hala ere, honako hau inferi genezake, alegia, espezie ezberdinen antzutasuna gurutzatzean eta haien ondorengo hibridoena, seguraski haien elementu sexualen izaeraren mende dagoela, eta ez haien egitura edo osaera orokorreko ezein ezberdintasunen mende.