(1) _Increasing the red in the Dark Brahma × Minorca cross._--The Dark Brahma[19] belongs to the group of poultry that contains a majority of characters derived from the Aseel type. Nevertheless, its plumage is closely related to that of the Jungle-fowl, from which it may be derived on the assumption that the red part of the pattern has become, for the most part, white. However, a little red remains on the middle of the upper feathers of the wing-bar. I crossed such a bird with a Black Minorca, and, as reported in my earlier work,[20] the offspring were all black, except that the males showed some red on the wing-bar. The amount of red varied in the different males, and I decided to test the possibility of much increasing the amount of the red by selection in successive generations. So I chose the reddest cock to head the pen. In this pen (No. 632) 222 chicks were produced and grew to a stage in which their adult color could be determined. Of these 222 chicks, 160, or 72 per cent, were black, without red; 24, or 10.8 per cent, were black with some red; 38, or 11.7 per cent, were typical Dark Brahmas, and 9 others, or 4.5 per cent, were modified Dark Brahmas. [19] Plate 11. [20] Davenport, 1906, page 35. The following year (pen 732) I bred a cock derived from the last year's pen, a bird that resembled much the male Dark Brahma (except that it was somewhat darker), to sundry hens, hybrids between the Dark Brahma and Minorca--some of the first and some of a later hybrid generation, but all black except that some of the 1906 birds had a little buff on the breast and the primaries. The F1 (black) × F2 (Dark Brahma) gave 51 per cent black offspring, 27 per cent with a black-and-red Game pattern, and 22 per cent with the Dark Brahma pattern devoid of red. Thus the third generation suddenly gave me a red-and-black Game-colored bird (plate 12)! My interpretation of the foregoing results is as follows: The Dark Brahma gametic formula proves to be _CIrnwx_, whereas the Black Minorca is _C(IR)Nwx_, where (_IR_) is equivalent to, and merely a further analysis of, the _J_ of the formula of the Minorca as given in earlier sections. The _I_ stands for the Jungle pattern without red and _R_ is the red element in that pattern. Obviously _N_ and _R_ are the differential factors, 4 kinds of gametes occur in F1, and in every 16 offspring these factors are combined in the following proportions: 9 _NR_, 3 _Nr_, 3 _nR_, 1 _nr_ (compare the distribution of color types in the 222 offspring of pen 632). The F2 male selected as father of the next generation (in pen 732) was an extracted Dark Brahma in coloration and probably formed only 1 kind of gamete, _nr_; but the hens were heterozygous in respect to _N_ and _R_. Consequently 4 kinds of zygotes are to be expected in F3; and expectation was realized as indicated in table 68. TABLE 68.