Eight flowers on the crossed plants of the last or fourth generation in Table 6/81 were again crossed with pollen from one of the other crossed plants, and produced five capsules, containing by weight 2.07 grains of seeds. The plants raised from these seeds may be called the INTERCROSSED; and these form the fifth intercrossed generation.
Eight flowers on the self-fertilised plants of the same generation in Table 6/81 were again self-fertilised, and produced seven capsules, containing by weight 2.1 grains of seeds. The SELF-FERTILISED plants raised from these seeds form the fifth self-fertilised generation. These latter plants and the intercrossed are comparable in all respects with the crossed and self-fertilised plants of the four previous generations.
From the foregoing data it is easy to calculate that:
Ten Westerham-crossed capsules would have contained 6.26 grains weight of seed.
Ten intercrossed capsules would have contained 4.14 grains weight of seed.
Ten self-fertilised capsules would have contained 3.00 grains weight of seed.
We thus get the following ratios:—
Seeds from the Westerham-crossed capsules to those from the capsules of the fifth self-fertilised generation, in weight as 100 to 48.
Seeds from the Westerham-crossed capsules to those from the capsules of the fifth intercrossed generation, in weight as 100 to 66.
Seeds from the intercrossed capsules to those from the self-fertilised capsules, in weight as 100 to 72.