The Tragulidoe; have no incisors in the upper jaw, and only six grinding-teeth on each side of each jaw; while the canine is moved up to the outer incisor, and there is a diastema in the lower jaw.

The next teeth cut are the four incisors of the upper jaw.

The age of a horse, as also of nearly all animals whose hoofs are not cloven, even horned animals, may be known from the condition of the teeth: thus at thirty months of age a colt is said to lose the milk incisors from the middle of his mouth, two above and two below.

Hold a ticking watch between the teeth, or touch the upper incisors with a vibrating tuning-fork; close both ears, and observe that the ticking or vibration is heard louder.