spots and having a black tail, presumably formed gametes _CJnWX_, _CJnwX_, _CJNWX_, _CJNwX_. Mated with the White Leghorn, _CJNWx_, she produced 8 pure whites, 4 whites with some black and red, 2 buff and white, and 3 black with trace of white. Expectation in 16 offspring would be about 4 pure whites, 4 white mixed with pigment, 4 buffs with white (and black?), and 4 blacks mixed with other colors. This is merely an illustration of the way the confused combinations of colors become intelligible, and even necessary on the factor hypothesis. 6. BLACK COCHIN × BUFF COCHIN. (Plate 10.) The factors involved in this cross seem to be _CINx_ for the Black Cochin (in which _I_ stands for the Jungle pattern without any associated color factor) and _CjnX_ for the Buff Cochin, as before. The F1 generation has the zygotic composition _C2IjNnXx_, and the females are all black, except for a variable amount of red on the hackle, and the males are black and red, like Games. The F2 generation is remarkable. Since 3 factors are heterozygous, there are 64 possible combinations and 27 differing ones. In table 63 is given a list of these different combinations and of the probable associated somatic colors. The prefixed number indicates the frequency of each combination. TABLE 63. +----------------------------+----------------------------+----------------------------+ | 1 C2I2N2X2 Black. | 2 C2IiN2X2 Black. | 1 C2i2N2X2 Black. | | 2 C2I2N2Xx Black. | 4 C2IiN2Xx Black. | 2 C2i2N2Xx Black. | | 1 C2I2N2x2 Black. | 2 C2IiN2x2 Black. | 1 C2i2N2x2 Black. | | 2 C2I2NnX2 Black and red.| 4 C2IiNnX2 Black and red.| 2 C2i2NnX2 Black and red.| | 4 C2I2NnXx Black. | 8 C2IiNnXx Black. | 4 C2i2NnXx Black. | | 2 C2I2Nnx2 Black. | 4 C2IiNnx2 Black. | 2 C2i2Nnx2 Black. | | 1 C2I2n2X2 Buff. | 2 C2Iin2X2 Buff. | 1 C2i2n2X2 Buff. | | 2 C2I2n2Xx Buff. | 4 C2Iin2Xx Buff. | 2 C2i2n2Xx Buff. | | 1 C2I2n2x2 White. | 2 C2Iin2x2 White. | 1 C2i2n2x2 White. | +-----------------------------+---------------------------+----------------------------+ Uniting the blacks and black-and-reds (since red appears only in one sex and often not until late in life) we find the following relation between the calculated and the observed proportions in 86 offspring: Calculated, black 65, buff 16, white 5; observed, black 61, buff 17, white 8.