[Illustration: DUSTING--HOW SHALL WE DO IT?]

How does Mother Nature get rid of these poisons from our breath? Of
course, you say, "She uses the wind and the sunshine." Yes, the winds
can whisk up the poison and blow it away so fast, and the sunshine can
burn up the horrid smell so quickly, that even the air above big
cities, and in their streets, is quite clean enough for us to breathe,
except where the people are very closely crowded together and very
dirty. Mother Nature wants all of us to help in keeping the air clean.
This we can do by keeping ourselves and our houses clean, and by being
careful not to leave scraps of waste, or dirty things, in the streets
and cars and parks and other public places. And you children ought to
be very careful about your school yard and the halls and the
classrooms, where you spend so much of your time.




IN SCHOOL


I. BRINGING THE FRESH AIR IN

The only place where air is absolutely sure to be fresh is out of
doors. There, as we have seen, the sun and the winds keep it so all
the time. But, unluckily, we cannot spend all our time outdoors,
either when we are little or after we have grown up. So we must try in
every way that we can to bring the outdoors indoors--to get plenty of
fresh air and light into the houses that we live in, especially the