e noise of the
machinery of our bodies, but if you will place your fingers gently in
your ears you will hear a peculiar roaring sound. That sound which you
hear is the noise of the machinery of your body, which is in constant
motion.

Now, the heart, which pumps the blood into all portions of the body,
makes the greater portion of this noise. Do you know where your heart is
located? I supposed that most of you would point to your left side,
because you have so frequently heard it spoken of as being located
there. You have seen public speakers and others, when referring to their
heart, place their hands upon their left side. But if you will bend your
head forward so as to press your chin against your breast, as far down
as possible, the heart will be under and a few inches below your chin.
It is in the center of the body, and the lower portion of it comes near
to the ribs on the left side, and when it beats we can feel it throb by
placing our hand upon our left side; but the heart is more nearly in the
center of the body, and not wholly at the side. If you were to close
your hand as the boys do when they say they make a fist, the size of
your closed hand will be somewhat smaller than the heart.

[Illustration: Water and Syringe.]

In this tumbler I have some water which I have colored with red ink, so
as to represent blood. Here is a small glass syringe, such as can be
bought for a few cents in any drug store. Now, when I draw this little
handle up, you will see how the syringe is filled with this red water,
and when I press it down how the water is forced out of the syringe back
into the glass. This very clearly illustrates the principle upon which
all pumps and steam engines which pump water are made. Even the large
fire engine, which throws water such a great distance, is made largely
upon this principle.

You may possibly have been in the engine room, where the huge pumps
force the water into the reservoirs which supply the city with water for
drinking and other purposes. From the pumps and the reservoirs there are
great pipes which lead the water under the streets to many thousands of
houses which compose the city. After the water has been used it is
turned into the sewers, runs down into the river and back to the sea,
where it is evaporated, rises again in the clouds, and by the wind is
carried hundreds of miles over the country. Then it descends again in
the form of snow and rain, soaks down through the earth