From this absolute zero of fertility, the pollen of different species applied to the stigma of some one species of the same genus, yields a perfect gradation in the number of seeds produced, up to nearly complete or even quite complete fertility; and, as we have seen, in certain abnormal cases, even to an excess of fertility, beyond that which the plant's own pollen produces.
Antzutasuneko zero absolutu honetatik hasirik, genero bereko espezieren baten estigmara aplikaturiko espezie ezberdinen polenak mailaketa hobezina ematen du hazi kopuruan, ia ugalkortasun osoraino edo erabat osoraino; eta, ikusi dugun moduan, zenbait kasu anormaletan, ugalkortasun gehiegizkoraino ere, landarearen beraren polenak ematen duen baino gehiago emanez.