[135] 'Ueber die Eigenschaften,' &c, 1828, s. 13, 14.
[136] 'Naturalist's Library,' vol. xii. (1841), pp. 109, 156 to 163, 280, 281. Cream-colour, passing into Isabella (i.e. the colour of the dirty linen of Queen Isabella), seems to have been common in ancient times. See also Pallas's account of the wild horses of the East, who speaks of dun and brown as the prevalent colours.
[137] Azara, 'Quadrupèdes du Paraguay,' tom. ii. p. 307; for the colour of mules, see p. 350. In North America, Catlin (vol. ii. p. 57) describes the wild horses, believed to have descended from the Spanish horses of Mexico, as of all colours, black, grey, roan, and roan pied with sorrel. F. Michaux ('Travels in North America,' Eng. translat., p. 235) describes two wild horses from Mexico as roan. In the Falkland Islands, where the horse has been feral only between 60 and 70 years, I was told that roans and iron-greys were the prevalent colours. These several facts show that horses do not generally revert to any uniform colour.
[138] Dr. Sclater, in 'Proc. Zoolog. Soc.,' 1862, p. 164.
[139] W. C. Martin, 'History of the Horse,' 1845, p. 207.
[140] Col. Sykes' Cat. of Mammalia, 'Proc. Zoolog. Soc.,' July 12th, 1831. Williamson, 'Oriental Field Sports,' vol. ii., quoted by Martin, p. 206.
[141] Blyth, in 'Charlesworth's Mag. of Nat. Hist.,' vol. iv., 1840, p. 83. I have also been assured by a breeder that this is the case.
[142] One case is given by Martin, 'The Horse,' p. 205.
[143] 'Journal As. Soc. of Bengal,' vol. xxviii. 1860, p. 231. Martin on the Horse, p. 205.
[144] Hermann von Nathusius, 'Die Racen des Schweines,' Berlin, 1860; and 'Vorstudien fur Geschichte,' &c., 'Schweineschädel,' Berlin, 1864. Rütimeyer, 'Die Fauna der Pfahlbauten,' Basel, 1861.