+------+----+-------------------------------------------------------------+------+------+------+-------+ [A] Including 1 blue. [B] Including 2 blue. This result suggests the interpretation that one of the parents, probably the male, contains both heterozygous black and barring, while the other parent lacks the supermelanic coat and has homozygous barring. Then of the offspring half will be barred and half will be black and, consequently (since only the non-black show their barring), one-fourth will appear barred, one-fourth will appear of the Dark Brahma type, and half will be pure black or have the pattern obscured by the supermelanic coat. (3) _White Leghorn Bantam × Black Cochin._--In still another experiment (pen 511) I crossed a White Leghorn bantam and a Black Cochin as described in my report of 1906. Of 24 hybrids that developed, 10 were white or nearly so, 7 were black, and 7 were barred black and white. The White Leghorn was heterozygous in white (half of the offspring being not white) and heterozygous to barring. In pen 650 the barred birds were mated together with results as given in table 67. On the assumption that the zygotic formula of both hens and cocks is _BbN2Ww_ (compatible with a barred plumage) we get four-sixteenths of the offspring white, three-sixteenths mottled or barred and nine-sixteenths black or Game, thus approximating the observed result; i.e., 21, 16, 47 as compared with 23, 21, 40. The result supports the hypothesis of a barring factor, B. TABLE 67.--_Distribution of color in offspring of barred White Leghorn × Black Cochin hybrids._ +--------------------------------------+--------------------------------------+-------------------+ | Mother. | Father. | Offspring. | +---+----+---------------------+-------+---+----+---------------------+-------+---+---------+-----+ |No.|Gen.| Races. |Color. |No.|Gen.| Races. |Color. |Wh.|Spangled,|Black| | | | | | | | | | | barred | or | | | | | | | | | | |and blue.|Game.| +---+----+---------------------+-------+---+----+---------------------+-------+---+---------+-----+ |263| F1 |Bl. Coch. × Wh. Legh.|Barred.|265| F2 |Bl. Coch. × Wh. Legh.|Barred.| 8 | 8 | 16 | |361| F1 | Do. | Do. |265| F2 | Do. | Do. | 7 | 4 | 15 | |364| F1 | Do. | Do. |265| F2 | Do. | Do. | 8 | 9 | 9 | | +---+---------+-----+ | Total. |23 | 21 | 40 | +-----------------------------------------------------------------------------+---+---------+-----+ CHAPTER XII.