[6] Davenport, 1906, page 34, Plate V.
[7] Davenport, 1906, pages 62 to 64, fig. 46.
[8] Thus Wright (1902) says the shanks of the Silkies (in England) are "slightly feathered," and Baldanus (1896) says that (in Germany) they are feathered on the outer half.
[9] Bateson and Punnett (1908, p. 28) recognize three "kinds" of recessive whites—that of the Silkie, that of the Rose-comb bantams, and that of "white birds that have arisen in the course of our experiments." White Cochins have perhaps been one of the ancestors of Rose-comb bantams; Bateson's new white lay recessive in the White Dorking and when mated to the White Silkie throws Game-colored offspring.
[10] Wright (1902, p. 401) recognizes the variability of the blues. He advises the breeder of Andalusians that: "Black and white ones [offspring] can be weeded out at once; two or three months later birds absolutely too light, or dark and smoky, can be selected."
[11] 1906, page 49, figs. 35, 37, 37a.
[12] Goodale, 1909, has shown that in Plymouth Rocks males may be and females usually are heterozygous in barring. There is thus a clear difference between the barring of the Cochin × Tosa hybrid and that of the Plymouth Rock. The question of the heterozygous nature of the female sex, fully discussed by Goodale, will be considered by me in another place. [Note at time of correcting proof.]
[13] Does the graying of human hair represent an ontogenetically advanced condition of the melanic pigment as yellow represents the embryonic condition?
[14] Davenport, 1908, page 60.
[15] By homologous matings I mean those in which the germ-plasms of both parents are in the same condition with reference to the unit-character; i. e., both either possess it pure or lack it altogether.