children's shoes; but only leather makes good soles.

It is best not to wear rubbers too much, because the same
waterproofness, which keeps the rain and the snow out, keeps the
perspiration of your feet in, and is likely to make them damp. When
they are damp, they are as easily chilled as if they had been wet
through with rain or puddle water. Always take off your rubbers in the
house or in school, because they are holding in not only the water of
perspiration, but the poisons as well; and these will poison your
entire blood, so that you soon have a headache and feel generally
uncomfortable.


II. AN EARLY ROMP

The minute you are outside the door, the fresh morning air strikes
your face, and you draw four or five big breaths, as if you would like
to fill yourself as full as you could hold. If you have had a good
night's sleep and a good breakfast, the very feel of the outdoor air
will make you want to run and jump and shout and throw your arms
about. This warms you up finely and gives you a good color; but if you
keep it up long, you will notice that two things are happening: one,
that you are breathing faster than you were before; the other, that
your heart is beating harder and faster, so that you can almost feel
it throbbing without putting your hand on your chest.

If you run too hard, or too far, you begin to be out of breath, and
your heart thumps so hard that it almost hurts. What is your heart
doing? It is pumping; it is trying to pump the blood fast out to your
muscles to give them the strength to run with.