[423] Dr. Broca, in Brown-Sequard's 'Journal de Phys.,' tom. ii. p. 361.
[424] Dixon's 'Ornamental Poultry,' p. 325.
[425] 'Poultry Chronicle,' vol. i. p. 485. Tegetmeier's 'Poultry Book,' 1866, p. 41. On Cochins grazing, idem, p. 46.
[426] Ferguson on 'Prize Poultry,' p. 187.
[427] Col. Sykes in 'Proc. Zoolog. Soc.,' 1832, p. 151. Dr. Hooker's 'Himalayan Journals,' vol. i. p. 314.
[428] 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 Condicions de la Vie,' &c., Lille, 1863, p. 36) that the protuberance is not formed by the frontal bones, but by the ossification of the dura mater.
[429] 'Naturgeschichte Deutschlands,' Band iii. (1793), s. 400.
[430] The 'Field,' May 11th, 1861. I have received communications to a similar effect from Messrs. Brent and Tegetmeier.
[431] 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.
[432] Macgillivray, 'British Birds,' vol. i. p. 25.