A few words explanatory of the three tables must be given. Each is devoted to one of the three forms, and is divided into six compartments. The two upper ones in each table show the number of good seeds resulting from the application to the stigma of pollen from the two sets of stamens which correspond in length with the pistil of that form, and which are borne by the other two forms. Such unions are of a legitimate nature. The two next lower compartments show the result of the application of pollen from the two sets of stamens, not corresponding in length with the pistil, and which are borne by the other two forms. These unions are illegitimate. The two lowest compartments show the result of the application of each form’s own two kinds of pollen from the two sets of stamens belonging to the same form, and which do not equal the pistil in length. These unions are likewise illegitimate. The term own-form pollen here used does not mean pollen from the flower to be fertilised--for this was never used--but from another flower on the same plant, or more commonly from a distinct plant of the same form. The figure “0” means that no capsule was produced, or if a capsule was produced that it contained no good seed. In some part of each row of figures in each compartment, a short horizontal line may be seen; the unions above this line were made in 1862, and below it in 1863. It is of importance to observe this, as it shows that the same general result was obtained during two successive years; but more especially because 1863 was a very hot and dry season, and the plants had occasionally to be watered. This did not prevent the full complement of seed being produced from the more fertile unions; but it rendered the less fertile ones even more sterile than they otherwise would have been. I have seen striking instances of this fact in making illegitimate and legitimate unions with Primula; and it is well known that the conditions of life must be highly favourable to give any chance of success in producing hybrids between species which are crossed with difficulty. TABLE 4.23. Lythrum salicaria, long-styled form. TABLE 4.23.1. Legitimate union. 13 flowers fertilised by the longest stamens of the mid-styled. These stamens equal in length the pistil of the long-styled. Product of good seed in each capsule. 36 53 81 0 0 0 0 0 0 0 - 0 45 41 38 percent of these flowers yielded capsules. Each capsule contained, on an average, 51.2 seeds. TABLE 4.23.2. Legitimate union. 13 flowers fertilised by the longest stamens of the short-styled. These stamens equal in length the pistil of the long-styled. Product of good seed in each capsule. 159 104 43 119 96 poor seed. 96 103 99 0 131 0 116 - 114 84 percent of these flowers yielded capsules. Each capsule contained, on an average, 107.3 seeds. TABLE 4.23.3. Illegitimate union.