[138] See Busk in Trans. Zool. Soc. vi. 1868, p. 227.
[139] There are, however, three milk forerunners of the premolars, of which one has no successor.
[140] Lydekker, An. Mus. La Plata, Pal. Arg. iii. 1894.
[141] M. F. Woodward "On the Milk Dentition of Procavia (Hyrax) capensis, etc," Proc. Zool. Soc. 1892, p. 38.
[142] "On the Species of the Hyracoidea," Proc. Zool. Soc. 1892, p. 50.
[143] Sir W. H. Flower, The Horse, London, 1890.
[144] See Ewart, The Penicuik Experiments, Constable and Co., 1899.
[145] The Horse, London, 1890.
[146] Cuyer and Alix, Le Cheval, Paris, 1886.
[147] Lubbock, Prehistoric Times, London, 1865.