Children should not try to wear old persons' glasses, as this is likely to injure their eyes.
~23.

How to Keep the Eyes Healthy.~--( 1.) Never continue the use of the eyes at fine work, such as reading or fancy-work, after they have become very tired.
(2.) Do not try to read or to use the eyes with a poor light--in the twilight, for instance, before the gas or lamps are lighted.
(3.) In reading or studying, do not sit with the light from either a lamp or a window shining directly upon the face.

Have the light come from behind and shine over the left shoulder if possible.
(4.) Never expose the eyes to a sudden, bright light by looking at the sun or at a lamp on first awaking in the morning, or by passing quickly from a dark room into a lighted one.
(5.) Do not read when lying down, or when riding on a street car or railway train.
(6.) If any object gets into the eye have it removed as soon as possible.
(7.) A great many persons hurt their eyes by using various kinds of eye-washes.

Never use anything of this kind unless told to do so by a good physician.
~24.

How we Smell.~--If we wish to smell anything very strongly, we sniff or suddenly draw the air up through the nose.