decidedly narrow. The nippers show a well-defined dark streak just in front
of the cups. This is the beginning of the dental star.

NINE YEARS.--The appearance of the table surface is more characteristic at
this time than the previous year. The cups are less prominent and the
plainness or smoothness of the inferior table is more noticeable. The
nippers are round, the cups triangular and the dark streak narrower and
more distinct than the previous year. The dividers are becoming round and
the corner teeth are oval.

TEN YEARS.--The teeth are more oblique than in the eight-year-old and
nine-year-old mouth. The table surfaces of the inferior nippers are
decidedly rounded, the cups are small, triangular and situated well toward
the posterior borders. The dark brown streak or dental star is situated in
the central portion of the nippers and dividers. The tables of the dividers
are round.

ELEVEN YEARS.--The tables of the corner teeth are rounded. The dark streak
or dental star is present in all of the teeth, and the remnants of the cups
appear as small rings or spots of enamel near to the posterior borders of
the tables. The notch in the superior corners may reappear at this time.

TWELVE YEARS.--The profile of the teeth when viewed from the side is quite
oblique. The table surfaces of all the incisors are round. But a trace of
the cup remains in the inferior incisors. The head of the animal is
beginning to show age. The inferior border of the jaw bone appears
narrower, or sharper than in the young horse.

THIRTEEN YEARS.--All of the specks of enamel or the remnants of the cups
are gone from the lower incisors. A larger notch may be present in the