e
there are in the world, besides all the animals--for all creatures that
breathe, spoil the air just as we do--there can hardly be trees and
plants enough to set all the air right again.

Round about cities and large towns there are certainly more people than
there are trees, but in many other parts of the world there are a great
many more trees than there are people.

I have heard of forests in South America so thick and so large, that the
monkeys might run along the tops of the trees for a hundred miles. So
you see there are plenty of trees in the world to do the work.

But then, how does all the bad air leave the towns and cities where men
live, and get to the forests and meadows?

The air is constantly moving about; rising and falling, sweeping this
way or that way, and traveling from place to place.

Not only the little particles out of our breath, but any thing that
gives the air any smell, does it some harm. Even nice smells, like those
of roses, are unhealthy, if shut up in a room for some time.

Dirty walls, ceilings, and floors give the air a musty, close, smell; so
do dirty clothes, muddy boots, cooking, and washing. Some of these ought
not to be in the house at all; others remind us to open our windows
wide.

All the things I have been saying to you about pure air, apply still
more to sick people than to healthy ones.

* * * * *

Directions for Reading.--Read the following sentences carefully, and
avoid running the words together.

The good__air can not get__in at__all.

We are__apt to take__it for granted.

It__is sure to make them__ill.

Point out three other places in the lesson where similar errors are
likely to occur.

* * * * *

Language Lesson.--Add _ment_ to each of the following words, and then
give the meaning of the words so formed.

_arrange move settle encourage_

* * * * *

LESSON XXXI.

dis tinct'ly, _clearly; plainly_.

a roused', _wakened_.

re ced'ing, _going backward or away from_

vig'i lant, _watchful; careful_.

ex haust'ed, _tired out with work_.

pre ced'ing, _going before_.

fort'night, _two weeks' time_.

con vul'sive, _irregular in movement_.

tar'ried, _delayed; remained_.

grad'u al ly, _step by step; slowly_.

* * * * *

A TIMELY RESCUE.

It was in the month of