Part 6 (1/2)

A grown person has thirty-two teeth, sixteen in each jaw.

6. To preserve my teeth:

I must keep them clean.

I must not scratch the enamel.

I must not eat or drink anything very hot or very cold.

I must not use them for scissors or nut-crackers.

I must not burn them with tobacco or cigars.

7. _About Eating._--When I eat I move my lower jaw only.

My tongue brings the food between my teeth, the cutters cut it, the tearers tear it, the grinders grind it, the saliva moistens it, and my tongue helps me to swallow it.

QUESTIONS FOR THE FORMULAS.

1. Tell about your eyes.

2. Tell about your ears.

3. Tell about your nose.

4. Tell about your mouth.

5. Tell about your teeth.

6. What is necessary if you would preserve your teeth?

7. Tell about eating.

[Ill.u.s.tration

1, the muscle which raises the upper eyelid.

2, the upper oblique muscle.

7, the lower oblique muscle. The oblique muscles roll the eye inward and downward.

4, 5, 6, three of the _four_ straight muscles. Two of the straight muscles roll the eye up and down; the other two move it right and left.

3, the pulley through which the upper oblique muscle plays.]

QUESTIONS ON THE DESCRIPTION OF THE EYES.

Of what shape is the eye?--”It is round like a ball.”

In what is it placed?--”In a deep, bony socket.”