[7] Naturalists differ with respect to the homologies of the digits of birds; but several uphold the view above advanced. See on this subject Dr. E. S. Morse in ‘Annals of the Lyceum of Nat. Hist. of New York,’ vol. x. 1872, p. 16.
[8] A. Walker on Intermarriage, 1838, p. 160.
[9] ‘The Farrier and Naturalist,’ vol. i. 1828, p. 456. A gentleman who has attended to this point, tells me that about three-fourths of white-faced horses have white legs.
[10] Godron, ‘Sur l’Espèce,’ tom. ii. p. 217.
[11] ‘Quadrupèdes du Paraguay,’ tom. ii. p. 333.
[12] On Sheep, p. 142.
[13] ‘Ueber Racen, Kreuzungen,’ etc., 1825, s. 24.
[14] Quoted from Conolly, in ‘The Indian Field,’ Feb. 1859, vol. ii. p. 266.
[15] In the third chapter I have said that “the hair and horns are so closely related to each other, that they are apt to vary together.” Dr. Wilckens (“Darwin’s Theorie,” ‘Jahrbuch der Deutschen Viehzucht,’ 1866, 1. Heft) translates my words into “lang-und grobhaarige Thiere sollen geneigter sein, lange und viele Hörner zu bekommen” and he then justly disputes this proposition; but what I have really said, in accordance with the authorities just quoted, may, I think, be trusted.
[16] ‘Domesticated Animals of the British Islands,’ pp. 307, 368. Dr. Wilckens argues (‘Landwirth. Wochenblatt,’ Nr. 10, 1869) to the same effect with respect to domestic animals in Germany.