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. We do this to bring
more air to the nerves of smell, which are placed at the upper part of
the inside of the nose.

[Illustration: INSIDE OF THE NOSE.]

~25.~ Smelling is a sort of feeling. The nerves of smell are so
sensitive that they can discover things in the air which we cannot taste
or see. An Indian uses his sense of smell to tell him whether things
are good to eat or not. He knows that things which have a pleasant smell
are likely to be good for him and not likely to make him sick.

We do not make so much use of the sense of smell as do the savages and
many lower animals, and hence we are not able to smell so acutely. Many
persons lose the sense of smell altogether, from neglecting colds in the
head.

~26. How we Taste.~--The tongue and the palate have very delicate nerves
by means of which we taste. We cannot taste with the whole of the
tongue. The very tip of the tongue has only nerves of touch or feeling.

~27.~ The use of the sense of taste is to give us pleasure and to tell
us whether different substances are healthful or injurious. Things which
are poisonous and likely to make us sick almost always have an
unpleasant taste as well as an unpleasant odor. Things which have a
pleasant taste are usually harmless.