Archive image from page 40 of Dentition as indicative of the. Dentition as indicative of the age of the animals of the farm dentitionasindic00browrich Year: 1895 of the Animals of the Fmm. 37 the observation of the state of the dentition between the ages of one and six months, when the fourth molar is cut; but during this period the jaws expand, the incisor teeth gradually become less crowded, and the space between the third molar and the angle of the jaw increases as the fourth molar, which is the first per- manent tooth, advances to occupy its place, as shown in Fig. 30. At the age o sic m
Archive image from page 40 of Dentition as indicative of the. Dentition as indicative of the age of the animals of the farm dentitionasindic00browrich Year: 1895 of the Animals of the Fmm. 37 the observation of the state of the dentition between the ages of one and six months, when the fourth molar is cut; but during this period the jaws expand, the incisor teeth gradually become less crowded, and the space between the third molar and the angle of the jaw increases as the fourth molar, which is the first per- manent tooth, advances to occupy its place, as shown in Fig. 30. At the age o sic months the fourth molar is well developed, but it is in close contact with the angle of the jaw, and the pos- terior surface is not quite free from the covering of the gum. Bettveen six and ta-elre vionths old there are no important Fig. 31.—hicisors of Steer at one year. •dental changes, the incisor teeth become worn, and as the jaws increase in size there is more space left between them ; but it is not possible to assert from the states of the incisor teeth whetlier an animal is under or over the age of one year. The illustration above (Fig. 31) represents the average state of the incisors at the age of one year. Shortly after one year the fifth molar begins to make its appearance, and at fifteen months it is well up. The appear- ance which the fifth molar presents at this age is very much like that of the fourth molar at the age of six months. The new tooth is in close contact with the angle of the jaw, and the gum covers the extreme posterior part of its surface. These appeai'- ances are shown in the illustration on next page (Fig. 32).
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