The Horse : its treatment in health and disease, with a complete guide to breeding, training and management . Fig. H67.—Upper Molars of Fossil Ancestors of the Horse a, Hyracotherium; h, Mesohippus; c, Anchitherium;(I, Protohippus; e, Hipparion; /, Horse — 1, dentine;2, enamel; 3, crusta petrosa. The worn or exposed surfaces of the ujDper molar teeth of five of thesefossil animals and of thehorse are represented infig. 667; in order that thedeveloj^ment from the com-paratively simple structureof the tooth of the Hyra-cotherium to the compli-cated details of the teethof the Hipparion and horsem
The Horse : its treatment in health and disease, with a complete guide to breeding, training and management . Fig. H67.—Upper Molars of Fossil Ancestors of the Horse a, Hyracotherium; h, Mesohippus; c, Anchitherium;(I, Protohippus; e, Hipparion; /, Horse — 1, dentine;2, enamel; 3, crusta petrosa. The worn or exposed surfaces of the ujDper molar teeth of five of thesefossil animals and of thehorse are represented infig. 667; in order that thedeveloj^ment from the com-paratively simple structureof the tooth of the Hyra-cotherium to the compli-cated details of the teethof the Hipparion and horsemay be more readily fol-lowed, those figures aredrawn of the same size,although in nature thereis a gradual increase insize as well as in com-plexity. Of these examples the first three belong to the brachydont or short-ciowned class, of whicha side view is given at a, fig. 668, whilst the teeth of the Protohippusand Hipparion show an advance towardsthe state of hypsodont or high-crownedteeth (b, fig. 668) which culminates inthe horse (c, in the same figure). Next in chronological order to thePhenacodu
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Keywords: ., bookcentury1900, bookdecade1900, bookidhorseit, booksubjecthorses
