ts or hard candy with
your teeth. If you do, you may crack or scratch the delicate glassy
coating of your teeth. But, on the other hand, it is a good thing to
give the teeth plenty to do, and particularly to eat the crusts of
bread, and some of the tougher parts of meat, and parched corn or
other grains, and to eat celery, apples, and other foods that take a
great deal of chewing. The teeth are like everything else in the
body--they need plenty of vigorous work in order to keep them healthy.

Be very careful, though, to keep out of your mouth anything that might
possibly crack or scratch the glassy coating, such as pins, pennies,
pieces of wire, or slate pencils. It is best not even to try to bite
off threads or pieces of string. There is, of course, another reason
for not putting pencils and pennies and such things into your mouth:
they may have dirt, or germs, on them and infect you with disease or
at least upset your digestion.

II. THE LAND OF NOD

Now you are all ready for bed; and the white pillow and the nice,
clean sheets and the warm blankets look very good to you, and you are
ready to go to the "Land of Nod."

You need not be afraid of the cold at night. Open your bedroom
windows. Have plenty of light-weight, warm covers; then the cold
breezes won't hurt you, but will make you strong. Just think how many
hours you are in bed,--nearly half of your life,--and you need fresh,
moving air all the time. Be sure to open your windows from the top as
well as from the bottom. You know why: your breath is warm so that it
floats and rises like smoke; and if you open the window only at the
bottom, this bad air, which rises to the top of the room, can't get
out. It is best to have windows on two sides of a bedroom, so that the
air can be kept moving through it all night long. If you don't breathe
fresh air while you sleep, you will feel dull and stupid in the
morning and perhaps have a headache.

So run your window shades right up to the top and throw your curtains,
or shutters, back, as well as open the windows. If you don't, the
fresh air cannot blow through the room properly. Even if this does let
more light or noise into the room, this is of no importance whatever
compared with abundance of fresh air. If you have played long enough
out of doors in the daytime and have eaten a good supper and not
stayed up too late, you will sleep soundly without being bothered at
all by either lights or noises coming in through