[63] Dr. Broca, in Brown-Séquard’s ‘Journal de Phys.,’ tom. ii. p. 361.
[64] Dixon’s ‘Ornamental Poultry,’ p. 325.
[65] ‘Poultry Chronicle,’ vol. i. p. 485. Tegetmeier’s ‘Poultry Book,’ 1866, p. 41. On Cochins grazing, ibid., p. 46.
[66] Ferguson on ‘Prize Poultry,’ p. 87.
[67] Col. Sykes in ‘Proc. Zoolog. Soc.,’ 1832, p. 151. Dr. Hooker’s ‘Himalayan Journals,’ vol. i. p. 314.
[68] See Mr. Tegetmeier’s account with woodcuts of the skull of Polish fowls in ‘Proc. Zoolog. Soc.,’ Nov. 25th, 1856. For other references, see Isid. Geoffroy Saint-Hilaire, ‘Hist. Gén. des Anomalies,’ tom. i. p. 287. M. C. Dareste suspects (‘Recherches sur les Conditions de la Vie,’ etc., Lille 1863, p. 36) that the protuberance is not formed by the frontal bones, but by the ossification of the dura mater.
[69] ‘Naturgeschichte Deutschlands,’ Band iii. (1793), s. 400.
[70] The ‘Field,’ May 11th, 1861. I have received communications to a similar effect from Messrs. Brent and Tegetmeier.
[71] It appears that I have not correctly designated the several groups of vertebræ, for a great authority, Mr. W. K. Parker (‘Transact. Zoolog. Soc.,’ vol. v. p. 198), specifies 16 cervical, 4 dorsal, 15 lumbar, and 6 caudal vertebræ in this genus. But I have used the same terms in all the following descriptions.
[72] Macgillivray, ‘British Birds,’ vol. i. p. 25.