Legitimate │ │ │ │ │ union. │ │ │ │ │ ──────────────┼─────────┼─────────┼─────────┼─────────┼───────── Short-styled │ 17 │ 3 │ 19 │ 6 │ 12.1 form by │ │ │ │ │ own-form │ │ │ │ │ pollen: │ │ │ │ │ Illegitimate│ │ │ │ │ union. │ │ │ │ │ ──────────────┼─────────┼─────────┼─────────┼─────────┼───────── The two │ 20 │ 14 │ 62 │ 37 │ 47.1 legitimate │ │ │ │ │ unions │ │ │ │ │ together. │ │ │ │ │ ──────────────┼─────────┼─────────┼─────────┼─────────┼───────── The two │ 30 │ 7 │ 49 │ 2 │ 35.5 illegitimate│ │ │ │ │ unions │ │ │ │ │ together. │ │ │ │ │ ══════════════╧═════════╧═════════╧═════════╧═════════╧═════════ From other long-styled plants, fertilized with their own-form pollen, 72 plants were raised, which were made up of 68 long-styled and 4 short-styled. In all, 162 illegitimate unions of this sort produced 156 long-styled and 6 short-styled plants. It is evident from these results that the long-form pistils, fertilized with pollen from flowers of the same pistil-form (from other individuals as a rule), tend to produce the same form as their parents, although occasionally the other form. The fertility of these plants from an illegitimate union is found to be very low. Darwin observed that sometimes the male and female organs of these plants were in a very deteriorated condition. It is interesting to notice, in this connection, that in another species, _Primula sinensis_, illegitimate plants from long-styled parents were vigorous, but the flowers were small and more like the wild form. They were, however, perfectly fertile. Illegitimate plants from short-styled parents were dwarfed in stature, and often had a weakly constitution. They were not very fertile _inter se_, and remarkably infertile when legitimately fertilized. This kind of result, where a difference in the power of mutual intercrossing exists between two forms, recalls in many ways the difference in the results of crossing of different species of animals and plants, especially those cases in which a cross can be made in one way more successfully than in the other.