Why would not an eye shaped like a cube do for us?--"It would not look well; it could not be rolled about." Why would not an eye shaped like a cone or cylinder do for us?--"It could not be rolled in every direction." Why is the ball-shape best for the eye?--"It looks best, and may be rolled in every direction." What part of the eye do we see through?--"The black spot in the centre." What is it called?--"The pupil." What shape is the pupil?--"Round like a circle." What color is the pupil?--"Black." Of what use is the pupil?--"To let light into the eye; to see through." What is around the pupil?--"A colored ring." What is the colored ring called?--"The iris." Of what use is the iris?--"It acts like a curtain to the eye; it lets in and keeps out light from the pupil." Of what shape is the iris?--"Round like a ring." Of what color is the iris?--"Sometimes blue, sometimes brown, sometimes gray." Does the iris always appear the same in size?--"It does not: sometimes it looks large, sometimes small." When is it the largest?--"When it rolls over the pupil to keep out the strong light." When is it the smallest?--"When it rolls backward, to let light into the pupil." When is the pupil the largest?--"When we are in the dark." When is the pupil the smallest?--"When we are in a bright light." What color is the eyeball?--"White." What shape is the eyeball?--"Round like a ball." How is the eyeball held in its socket?--"By cords made of flesh." Where are the eyebrows?--"Above the eyelids." Of what use are the eyebrows?--"To keep the perspiration from rolling into the eyes." Where are the eyelids?--"Over the eyes." Of what use are they?--"They cover the eyes and keep them from getting hurt." Where are the eyelashes?--"On the edges of the eyelids." Of what use are the tears?--"They keep the eyes clean; they make the eyes move easily in their sockets." Where are the tears made?--"Back of the eyebrows." When do the tears wash the eyes?--"Every time we wink our eyelids." * * * * * QUESTIONS ON THE EARS. Name the parts of the ear. Where are your ears?--"On the sides of my head." Which is the rim of the ear?--"The edge of the ear." Which is the flap of the ear?--"The lower part of the ear." Where is the drum of the ear?--"Inside of the ear." How is the drum protected?--"By stiff hairs and a bitter wax at its entrance." * * * * * QUESTIONS ON THE NOSE. Where is the nose?--"In the middle of the face." Name the parts of the nose. Where is the tip of the nose?--"At the end of the nose." Where is the bridge of the nose?--"At the top of the nose, between the eyes." Where is the cartilage?--"In the middle of the inside of the nose." Of what use is the nose?--"To smell and breathe through." What are the nostrils?--"The openings inside of the nose." Of what use are the nostrils?--"To let the air into and out of the opening back of the mouth."