CHAPTER XIV.
HOW TO KEEP THE LUNGS HEALTHY.
~1.

Pure Air Necessary.~--A person may go without eating for a month, or without drinking for several days, and still live; but a strong man will die in a few moments if deprived of air.

It is very important that we breathe plenty of pure air.

There are many ways in which the air becomes impure.
~2.

Bad Odors.~--Anything which rots or decays will in so doing produce an unpleasant odor.