36. At six weeks, &c. 69 37. At six months, &c. 69 38. At nine months old, the corner milk teeth are up, but their edges do not yet meet. 70 39. At one year, &c. 70 40. At eighteen months, &c. 71 41. At two years old, there is a full mouth of milk incisors, all of which show considerable wear. 71 42. At three years old, the centre horse teeth are well up, and are distinguished by their size, shape, and colour. 72 43. At three years off, the lateral milk teeth are shed, and the permanent teeth are coming up. 80 44. When rising four years old the lateral horse teeth are in the mouth, but their edges do not fairly meet. 81 45. At four years, four pair of horse teeth are well up, but the corner milk teeth are retained. 82 46. When rising five years old all the horse teeth are in the mouth, but the corner teeth have yet to meet. 90 47. At five years old there is a full mouth of horse incisors, all the edges of which fairly meet. 94 48. At five years off the corner teeth only show slight wear, and the posterior margins are round. 95 49. At six years of age the corner teeth look more firmly set, and their edges begin to be uneven; &c. 97 50. At seven years off, the corner teeth, without showing age, exhibit further evidence of wear. 99 51. At eight years off, the gum of the lower corner tooth has become square, and the lower tush blunt. 104 52. After the eighth year, &c. 106 53. At twelve years old, there may be tartar on the lower tush. The teeth are longer, narrower, and the enamel darker. 110 54. At sixteen years old, when the teeth are viewed from the side, only two incisors can be seen in the lower jaw, &c. 112 55. At twenty years old, the form of the mouth has changed, and the lower teeth are imperfectly seen from the front. 115 56. At thirty years old, the jaws are contracted; the lower are not seen when the upper teeth are in view. 117 57. The tricks that are practised on the teeth, &c. 123 58. The irregularities of growth in the horse's teeth &c. 138 59. The diseases to which the teeth of the horse are subjected, &c. 149