a fresh cup every time you want one; but of course you should be sure
first that the paper itself is clean.

If you drink milk, this takes the place of some of the water and gives
you food as well. It is both drink and food; and a very good food for
children it is, too. You know, babies can live on it because it has
everything in it to make them grow.

Do you know why it is that people are so careful nowadays about having
milk and drinking-water very clean? It is because they have found that
the tiny plants, called germs, that make people sick are often carried
about in these drinks. A disease called _typhoid fever_ is carried in
this way.

Fifty years ago, cities and towns used to be very careless about where
they got their water supply, and would often take it out of streams
into which other cities emptied their sewage. Now, however, they are
much more particular; and the health officers, or Boards of Health,
are insisting that public water supply, such as is brought into our
houses in pipes, shall be taken either from some spring or
deep-flowing well, or from a stream or lake up in the hills, into
which no drainage from houses or farmyards, and no dirty water from
factories, empties.

[Illustration: A PIPE FOR THE CITY WATER SUPPLY

This pipe is laid for many miles to bring water from the distant
hills.]

We are still, however, far from being as careful as we should be about