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.