My eye is like a ball in a deep, bony socket. The black circle in the centre is the pupil or window of my eye; the colored ring is the iris or curtain; the white part is the eyeball. My upper and lower eyelids cover and protect my eyes. My eyebrows are for beauty, and keep the perspiration from rolling into my eyes. My eyes are washed by teardrops every time I wink my eyelids. 2. _The Ears._--My ears are to hear with: the rim of my ear, the flap of my ear, the drum of my ear. The drum of my ear is protected by a fence of short, stiff hairs, and by a bitter wax about the roots of these hairs. 3. _The Nose._--My nose is to smell and breathe with; it is in the middle of my face: my two nostrils, the bridge of my nose, the cartilage, the tip of my nose. My nostrils lead to a passage back of my mouth through which I breathe. The cartilage separates my nose into two parts. 4. _The Mouth._--My mouth is to speak, eat, and breathe through: my upper lip, my lower lip. In my mouth are: my tongue, my lower teeth, my upper teeth, my lower teeth, and my upper and lower jaws, covered with flesh called _gum_. 5. _The Teeth._--My teeth are used in eating and talking. My teeth are made of a soft kind of bone, covered with enamel. I have three kinds of teeth: cutting teeth, tearing teeth, grinding teeth. A young child has twenty teeth, ten in each jaw. 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. * * * * * [Illustration 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." What is a socket?--"A hollow place." Why is the eye placed in a deep, bony socket?--"To keep it from getting hurt."