[42] Azara, ‘Quadrupèdes du Paraguay,’ tom. ii. p. 307. 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 soon revert to any uniform colour. [43] Dr. Sclater, in ‘Proc. Zoolog. Soc.,’ 1862, p. 164. Dr. Hartmann says (‘Annalen der Landw.’ B. xliv. p. 222) that this animal in its wild state is not always striped across the legs. [44] W. C. Martin, ‘History of the Horse,’ 1845, p. 207. [45] Col. Sykes’ Cat. of Mammalia, ‘Proc. Zoolog. Soc.’ July 12th, 1831. Williamson ‘Oriental Field Sports,’ vol. ii., quoted by Martin, p. 206. [46] 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. [47] (One case is given by Martin, ‘The Horse,’ p. 205. [48] ‘Journal As. Soc. of Bengal,’ vol. xxviii. 1860, p. 231. Martin on the Horse, p. 205. CHAPTER III. PIGS—CATTLE—SHEEP—GOATS PIGS BELONG TO TWO DISTINCT TYPES, SUS SCROFA AND INDICUS—TORFSCHWEIN—JAPAN PIGS—FERTILITY OF CROSSED PIGS—CHANGES IN THE SKULL OF THE HIGHLY CULTIVATED RACES—CONVERGENCE OF CHARACTER—GESTATION—SOLID-HOOFED SWINE—CURIOUS APPENDAGES TO THE JAWS—DECREASE IN SIZE OF THE TUSKS—YOUNG PIGS LONGITUDINALLY STRIPED—FERAL PIGS—CROSSED BREEDS. CATTLE—ZEBU A DISTINCT SPECIES—EUROPEAN CATTLE PROBABLY DESCENDED FROM THREE WILD FORMS—ALL THE RACES NOW FERTILE TOGETHER—BRITISH PARK CATTLE—ON THE COLOUR OF THE ABORIGINAL SPECIES—CONSTITUTIONAL DIFFERENCES—SOUTH AFRICAN RACES—SOUTH AMERICAN RACES—NIATA CATTLE—ORIGIN OF THE VARIOUS RACES OF CATTLE. SHEEP —REMARKABLE RACES OF—VARIATIONS ATTACHED TO THE MALE SEX—ADAPTATIONS TO VARIOUS CONDITIONS—GESTATION OF—CHANGES IN THE WOOL—SEMI-MONSTROUS BREEDS. GOATS —REMARKABLE VARIATIONS OF.