upper corner teeth than at twelve. The tables of the inferior nippers are
becoming triangular and show a small, dark spot or dental star.

FOURTEEN YEARS.--The tables of the inferior nippers are triangular, and the
dental star appears as a dark round spot in both the nippers and dividers.

FIFTEEN YEARS.--The angle with which the teeth meet is greater than at
twelve, the teeth are smaller and dental stars are represented by dark
round spots in all of the inferior incisors. The tables of the nippers and
dividers are triangular.

SEVENTEEN YEARS.--All of the tables of the lower incisor teeth are
triangular. The teeth are narrower and smaller than at fifteen. The profile
of the incisors, viewed from the side, is quite angular. The dental stars
are prominent.

NINETEEN YEARS.--All of the signs of the seventeen-year-old mouth are more
prominent. The cups have usually disappeared from the upper incisors.

[Footnote 1: This table is from dentition tables given in "Age of the
Domestic Animals," by Huidekoper.]


QUESTIONS

1. Name the different kinds of teeth; state the arrangement and number.

2. How is the age of an animal determined?

3. Give the time of replacement of the temporary incisor teeth.