Object Lessons on the Human Body Part 7

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."

QUESTIONS ON THE MOUTH, ETC.

Where is the mouth?--"In the lower part of the face, between the nose and the chin."

Of what use is the mouth?--"To breathe, speak, and eat through."

What is in the mouth?--"My tongue, my upper teeth, my lower teeth, and my upper and lower jaws."

What covers the jaws?--"Red flesh, called _gum_."

Of what are the jaws composed?--"Of bones."

Of what are the teeth made?--"Of dentine, covered with enamel." See note, p. 19.

What is enamel?--"A smooth, white substance, harder than bone."

Of what use are the teeth?--"To eat and talk with."

What kinds of teeth have you?--"Cutting teeth, tearing teeth, grinding teeth."

Describe the cutting teeth.--"The cutting teeth have broad and flat edges."

Describe the tearing teeth.--"The tearing teeth are sharp and pointed."

Describe the grinding teeth.--"The grinding teeth are the thick, back teeth."

Which jaw is moved in eating?--"The lower jaw."

What work do the teeth perform?--"They cut, tear, and grind the food."

How many teeth has a child in a full set?--"Twenty teeth: ten in each jaw."

How many teeth has a grown person in a full set?--"Thirty-two: sixteen in each jaw."

What does the tongue do in eating?--"It rolls the food between the teeth, and helps in swallowing."

What is the saliva?--"A kind of liquid, sometimes called _spit_."

Of what use is it in eating?--"It wets and softens the food."

What do you mean by preserve?--"To keep from injury."

What do you mean by injury?--"Hurt."

How do you preserve your teeth? See Formula.

How do very hot or very cold drinks hurt the teeth?--"They crack the enamel."

What happens if the enamel is cracked?--"The teeth decay."