+---------------------------------------------------------------------------------------------------+ | HIGH AND LOW GRADE OF BOOT IN PARENTS. | +---+-----------------------------+-----------------------+-----------------------------------------+ | | Mother. | Father. | Grade of boot in offspring. | |Pen|-----+----+-------------+----+-----+----+-------+----+--+--+--+--+--+--+--+--+--+--+--+--------+ |No.| | | | | | | | | | | | | | | | | | | | | | | No. |Gen.| Races. |Gra.| No. |Gen.| Race. |Gra.| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9|10|Average.| +---+-----+----+-------------+----+-----+----+-------+----+--+--+--+--+--+--+--+--+--+--+--+--------+ |851| 5567| P | Bl. × Bf. C.| 9 | 7526| P | Silkie| 3 |..|..|..|..| 2|..|..|..| 3| 3| 5| 8.15 | |851| 3410| P | Do. | 9 | 7526| P | Do. | 3 |..|..|..|..|..| 4| 3| 2| 1| 6| 1| 7.29 | |851| 6956| P | Do. | 8 | 7526| P | Do. | 3 |..|..|..|..| 3| 3|..| 2| 2|..| 5| 7.13 | |851| 2073| P | Do. | 7 | 7526| P | Do. | 3 |..| 1|..| 1| 1|..| 1| 1| 1| 3| 2| 6.91 | |851| 2299| P | Do. | 7 | 7526| P | Do. | 3 |..|..|..|..| 2| 2| 1| 1|..|..| 3| 6.78 | |851| 840| P | Bf. C. | 10 | 7526| P | Do. | 3 |..|..|..|..| 1|..| 1|..|..| 1|..| 6.33 | |851| 1002| P | Do. | 8 | 7526| P | Do. | 3 |..|..|..| 3| 1| 2| 1| 2| 4| 1| 1| 6.27 | |815| 131| P | Bk. C. | 10 | 774| P | Do. | 4 |..|..|..| 3| 1| 1| 2| 2| 1| 1| 2| 6.23 | |851| 841| P | Bf. C. | 10 | 7526| P | Do. | 3 |..|..|..|..| 1|..| 1|..| 1|..|..| 6.00 | |851| 838| P | Do. | 8 | 7526| P | Do. | 3 |..|..|..| 4| 2| 4| 3|..|..| 2| 2| 5.65 | | |--+--+--+--+--+--+--+--+--+--+--+--------+ | Totals (116) | 0| 1| 0|11|14|16|13|10|13|17|21| 6.77 | +---------------------------------------------------------+--+--+--+--+--+--+--+--+--+--+--+--------+ So far as the average grade of boot in offspring goes, this table stands between that of the Cochins (table 31, A) and that of the Silkies (table 31, C). But what is especially striking is the apparent dimorphism revealed in the line of totals. There is one (empirical) mode at 10, corresponding with that of the Cochins, and a second clear mode at 5, corresponding to that of the Silkies. If we assume the Cochin to be homozygous in boot (RR) and the Silkie to be heterozygous in boot, then we can interpret the high mode as extracted recessives, the median mode as heterozygotes. C. RESULTS OF HYBRIDIZATION. We have next to consider the nature of the inheritance when one parent belongs to an unbooted race, the other to a booted one (table 33).