TABLE 26.--_Progeny of tailless cock and tailed hens._ +------+------+--------+--------------------------+-----------------------------------+ | | | | Mother. | Offspring. | | | | +----+---------------------+-------------------------+---------+ |Serial| Pen |Father's| | | Condition of uropygium. |Per cent | | No. | No. | No. | No.| Races. |--------+------+---------|rumpless.| | | | | | |Present.|Small.| Absent. | | +------+------+--------+----+---------------------+--------+------+---------+---------+ | 1 |525 | 117 |114 | Nankin. | 3 | .. | 0 | 0 | | 2 |526 | 117 | 20A| Frizzle. | 8 | .. | 0 | 0 | | 3 |532 | 117 | .. |Bl. Coch. | 14 | .. | 0 | 0 | | 4 |532_a_| 117 |127 |Wh. Legh. | 19 | .. | 0 | 0 | | 4_a_|653 | 117 |508 |Bl. Coch. × Wh. Legh.| 8 | 3 | 0 | 0 | | | | | | +--------+------+---------+---------+ | | | | | Totals | 52 | 3 | 0 | 0 | +------+------+--------+----+---------------------+--------+------+---------+---------+ In 25 cases of the 52 an oil-gland was looked for and, in every case, it was found to be missing. Table 26, the conclusions from which were drawn in my 1906 report, seemed to indicate the dominance of tail over its absence. On this hypothesis I suspected that if No. 117 were bred to his (tailed) offspring about 50 per cent of the progeny would be tailless, and if the tailed hybrids of the F1 were bred together about 25 per cent of their progeny should be tailless. The actual result of such matings is shown in table 27. TABLE 27.--_Heterozygotes mated with father._