[17] Quoted by Mr. Herbert Spencer, 'Principles of Biology,' vol. i. p. 244.
[18] 'British and Foreign Medico-Chirurg. Review, 'April, 1861, p. 482-6; 'l'Héréd. Nat.,' tom. i. pp. 391-408.
[19] Dr. Osborne, Pres. of Royal College of Phys. in Ireland, published this case in the 'Dublin Medical Journal' for 1835.
[20] These various statements are taken from the following works and papers:—Youatt on 'The Horse,' pp. 35, 220. Lawrence, 'The Horse,' p. 30. Karkeek, in an excellent paper in 'Gard. Chronicle,' 1853, p. 92. Mr. Burke, in 'Journal of R. Agricul. Soc. of England,' vol. v. p. 511. 'Encyclop. of Rural Sports,' p. 279. Girou de Buzareignues, 'Philosoph. Phys.,' p. 215. See following papers in 'The Veterinary:' Roberts, in vol. ii. p. 144; M. Marrimpoey, vol. ii. p. 387; Mr. Karkeek, vol. iv. p. 5; Youatt on Goître in Dogs, vol. v. p. 483; Youatt, in vol. vi. pp. 66, 348, 412; M. Bernard, vol. xi. p. 539; Dr. Samesreuther, on Cattle, in vol. xii. p. 181; Percivall, in vol. xiii. p. 47. With respect to blindness in horses, see also a whole row of authorities in Dr. P. Lucas's great work, tom. i. p. 399. Mr. Baker, in 'The Veterinary,' vol. xiii. p. 721, gives a strong case of hereditary imperfect vision and of jibbing.
[21] Knight on 'The Culture of the Apple and Pear,' p. 31. Lindley's 'Horticulture,' p. 180.
[22] These statements are taken from the following works in order:—Youatt on 'The Horse,' p. 48; Mr. Darvill, in 'The Veterinary,' vol. viii. p. 50. With respect to Robson, see 'The Veterinary,' vol. iii. p. 580; Mr. Lawrence on 'The Horse,' 1829, p. 9; 'The Stud Farm,' by Cecil, 1851; Baron Cameronn, quoted in 'The Veterinary,' vol x. p. 500.
[23] 'Recreations in Agriculture and Nat. Hist.,' vol. i. p. 68.
[24] 'Ueber die Eigenschaften,' &c., 1828, s. 107.
[25] Bronn's 'Geschichte der Natur,' band ii. s. 132.
[26] Vrolik has discussed this point at full length in a work published in Dutch, from which Mr. Paget has kindly translated for me passages. See, also, Isidore Geoffroy St. Hilaire's 'Hist. des Anomalies,' 1832, tom. i. p. 684.