132

132

Mimulus

been exposed during the whole time to remarkably uniform conditions, were somewhat inferior in height to the plants of the seventh self-fertilised generation. But as we shall presently see that an analogous a similar experiment made after two more additional generations of self-fertilisation gives gave a different result, I know not whether to trust the present one. In three of the five pots in Table 19 a self-fertilised plant flowered first, and in the other two a crossed plant. These self-fertilised plants were remarkably fertile, for 20 flowers fertilised with their own pollen produced no less than 19 very fine capsules!

The effects of a cross with a distinct stock.—Some flowers on the self-fertilised plants in Pot IV. in Table 19. were fertilised with their own pollen, and plants of the eighth self-fertilised generation were thus raised merely to serve as parents for the following experiment. Several flowers on these latter plants were allowed to self fertilise themselves spontaneously (insects being of course