As yet I have not found a single terrestrial animal which can fertilise itself. 查尔斯·达尔文.物种起源.
Nearly all our orchidaceous plants absolutely require the visits of insects to remove their pollen-masses and thus to fertilise them. 查尔斯·达尔文.物种起源.
When this is done, there is no apparent reason why they should not yield as many seeds as did their parents when legitimately fertilised. 查尔斯·达尔文.物种起源.
From this extreme degree of sterility we have self-fertilised hybrids producing a greater and greater number of seeds up to perfect fertility. 查尔斯·达尔文.物种起源.
I have come to this conclusion from finding it an invariable rule that when a flower is fertilised by the wind it never has a gaily-coloured corolla. 查尔斯·达尔文.物种起源.
Of aquatic animals, there are many self-fertilising hermaphrodites; but here the currents of water offer an obvious means for an occasional cross. 查尔斯·达尔文.物种起源.
Corn and cotton seed are thus also planted, mixed or unmixed with the fertilising material. 威廉·亨利·杜利特.世纪发明.