away, also, and used in making new land or filling up hollow places.

Besides taking away the dirt, cities are careful to get clear, pure
drinking water. They are very, very careful about this; and they
usually have the water tested often, because, as you have learned,
even water that looks perfectly pure may give people typhoid fever.
That is why, when you are out in the country, on a picnic perhaps, you
must not drink from the streams. They may receive the drainage from a
farmer's barnyard, or the sewage from some house.

The more we all learn about these things, the more careful will the
city be to protect her people. To be sure, most cities now have Boards
of Health who employ men and women to go about and see that the food
in the stores is clean--no flies, no dust, and no tobacco smoke on it.
They have laws, too, about keeping milk clean; and in New York alone
these laws have saved the lives of thousands of babies. And they have
laws about the care of streets and buildings and cars and parks and a
great many other things.

In all these things we have been talking about, I want you to be
thinking how you can help. For a city is made up of people--boys and
girls and men and women. The city is what its people make it; and
everyone must help, even the smallest children, no older than little
Claude.

The first and most important thing for you to do is to keep yourself
clean and tidy. And the next thing is for you to keep your back yard
as well as your front yard and the school yard and the street free
from papers and sticks and cans and old playthings. You can put away
your things when you are through playing; or, if you are making a