Correlation and Application of Statistics to Problems of
Heredity 97 anticipate 9.9 °/O chestnut and 90.1 0/, non-
chestnut foals, a result almost exactly that observed. If we
judged by A (iii), A (iv), and G, we should conclude that black
and brown had no factor for chestnut. In that case chestnut and
bay crossed with black and brown would produce no chestnut
foals. This is flatly contradicted by C, D, E and F which
indicate that browns and blacks can contain a factor for
chestnut. The only explanation is, perhaps, a rather forced one,
namely that the matings in A (iii), A (iv) and G were few in
number and possibly made from a very few sires of brown and
black colour without factors for chestnut, while C, D, E and F,
providing far more numerous rnatings, contained blacks and
browns with such factors. C, D, E and F, indeed, tend to confirm
this, for when the sire is black or brown there are far fewer
chestnuts produced than when the dam is black or brown; in the
latter case the larger number of dams used would