While, if the progeny were all to survive to maturity, we might expect to get the proportions of white and of white-and-red progeny called for, yet, since the red color appears in most cases at an age _after_ the chicks are described, it will be necessary in comparing experience with calculation to combine the first two classes as whites. We then find the proportions given in table 60. TABLE 60. +------------+-----------------+-----------------------------+ | | | In the actual 85 | | Color. | In 64, | individuals. | | | calculated. +---------------+-------------+ | | | Calculated. | Observed. | +------------+-----------------+---------------+-------------+ | | | | | | White. | 52 | 69 | 68 | | Game. | 9 | 12 | 16 | | Black. | 3 | 4 | 1 | +------------+-----------------+---------------+-------------+ The proportion of whites agrees closely with expectation. If this is not the case with the other two classes, the discrepancy must be attributed in part to insufficient observations and in part to the difficulties of precise classification in the early stages. The result is so close, however, as to lend strong support to our hypothesis as to the gametic constitution of the parents. Nothing is more striking, and to the unprejudiced mind more convincing, than the appearance of typically Game-colored birds in the grandchildren of wholly white parents. 3. SILKIE × BUFF COCHIN. (Plates 7, 8.) By hypothesis this cross is between _cJnwx_ and _CjnwX_. The first generation should give the zygotic formula _CcJjn2w2Xx_, or, more simply, _CcJjXx_. The formula differs much from that of either parent, and the progeny themselves are no less remarkable. They have a washed-out buff color (since they are heterozygous in both _C_ and _X_), and the Jungle pattern shows itself in the black tail and slightly redder buff of the wing-bar and hackles in the male. Since the hybrids are heterozygous in respect to 3 pairs of characters, when segregation occurs each parent produces 8 kinds of gametes, as follows: _CJX_, _CJx_, _CjX_, _Cjx_, _cJX_, _cJx_, _cjX_, _cjx_. In F2 the types listed in table 61 may be expected in 64 offspring. TABLE 61.--_Distribution of colors, theoretic classes.--Probable frequency in 64 progeny._