The distribution of offspring in the 24 families of table 5 is in fair accord with any of the three hypotheses, but seems to favor the second, for that hypothesis calls for families with combless children, whereas such are not to be expected on the first hypothesis. Moreover, agreement with the second hypothesis is fairly close, for that calls for 3 families with combless children and there were actually 3 such families showing a total of 1.8 per cent combless, where expectation is 2.8 per cent. What is opposed to any hypothesis is the appearance of some Y-combed offspring; and to account for this the hypothesis is suggested that the germ-cells of some parents with oo comb contain traces of the I-comb determiner. The word "traces" is used because the median element in these Y-combed offspring is practically always very small. It is fair, consequently, to conclude that oo × oo gives oo-combed, and occasionally combless, offspring. This conclusion is further supported by the statistics derived from extracted oo comb of _all_ generations bred _inter se_, which give: Y 11, oo 427, and no comb 8, where the 11 Y-combed birds are those just referred to as progeny of F2 parents. The non-median comb, consequently, probably contains only non-median germ-cells. TABLE 6. +---+-------------------------------------------------+--------------+ | | Parents. | Offspring. | | |--------+-----+----------+------+-----+----------+----+----+----+ |Pen| ♀ |Form | Degree | ♂ |Form | Degree | | | | |No.| (F2). | of | of | (F2).| of | of | I | Y | oo | | | |comb.|splitting.| |comb.|splitting.| | | | |---|--------|-----|----------|------|-----|----------|----|----|----| | | | | _P. ct._ | | | _P. ct._ | | | | | | { 427 | Y | 5 | 439 | I | 0 | 5 | 1 | .. | |628| { 722 | Y | 20 | 439 | I | 0 | 1 | 5 | .. | | | { 725 | Y | 10 | 439 | I | 0 | 5 | 3 | .. | | | | | | | | | | | | |629| 427 | I | 0 | 491 | Y | 50 | 9 | 6 | .. | | | | | | | | | | | | |765| 1790 | I | 0 | 1794 | Y | 90 | 17 | 25 | .. | | | | | | | | | | | | | | {3846 | I | 0 | 6652 | Y | 90 | 8 | 5 | .. | |802| {5025 | I | 0 | 6652 | Y | 90 | 14 | 11 | 2 | | | {5087 | I | 0 | 6652 | Y | 90 | 13 | 17 | 2 | | | | | | | | | | | | |812| {4254 | I | 0 | 4118 | Y | 90 | 15 | 13 | .. | | | {5540 | I | 0 | 4118 | Y | 90 | 8 | 9 | .. |