[205]

Strawberry No. 116.

[diagram] This ought to be 1° & 3°

it might be engraved 1° — 3° or simply —1° 3°

[205v]

594 (38)

Chapter 0 9

of an illegitimate union depends at least in part, on the incapacity for interaction between the pollen-grains & stigma. Thus with Linum grandiflorum, as I have elsewhere shown,*(*journal of Lin Soc Bot Vol VII 1863 p 73-75) not more than two or three out of hundreds of pollen-grains, both of the long-styled or short-styled form, when placed on the stigma of their own form, emitted their tubes, and they did not penetrate deeply; nor does the stigma itself change colour, as always occurs when it is legitimately fertilised.

On the other hand With respect to the difference in innate fertility between plants raised from crossed and self-fertilised seeds, and the difference in fertility between the legitimate and illegitimate offspring of dimorphic and trimorphic plants, apparently this must depends i on some incompatibility between the sexual elements contained within the pollen-grains and ovules, as it is by through their union that new organism is formed.).

If we now inquire what is the immediate cause of self-sterility, whether or not this depends on casue the incapacity of inter-re action between the pollen-grains and the stigmatic secretion or tissues of the stigma belonging to of the same plant, we clearly see that in most cases it depends is determined by the conditions to which the plants have been subjected. Thus Eschscholtzia is quite