should be able to move about, to perceive,--that is, to hear, see,
feel, smell, taste, determine weight and distinguish temperature,--to
think, and to express ideas in language. In order to keep his vital
machinery in order, it is necessary that the body should also be able
to repair injuries which may occur in consequence of wear or accident,
and to remove out of the way wornout material which would otherwise
obstruct the working of the delicate machinery of which his body is
constructed. Each of these functions requires special organs and
apparatuses to carry on the work; and these we will now briefly
consider:--

The Nutritive Apparatus.--This consists of organs for the purpose of
taking in food or nourishment, digesting it, and distributing it
throughout the body wherever it is needed. These are chiefly the mouth
and teeth for receiving and chewing the food, the stomach and intestines
for digesting and absorbing it, and the heart and blood-vessels for
distributing it to the body.

The Moving Apparatus.--For the purpose of producing motion, we have
the muscles and the bones, by which the food is received, masticated,
and swallowed, the blood circulated, the body moved about from place
to place, and speech, expression, respiration, and many other important
functions performed.

The Thinking and Feeling Apparatus.--The brain and nerves afford the
means of thinking and feeling, also giving rise to all the activities
of the body by the production of nerve force. To aid the brain and nerves,
we have special organs provided, termed the organs of special sense;
as the eye for sight, the ear for hearing, the nose for the detection
of odors, the tongue for tasting, the skin and the mucous membrane for
the sense of touch.

The Purifying Apparatus.--Waste matter accumulates in the body so
rapidly that it is necessary to have abundant and efficient means to
remove the same, and prevent death by obstruction. This work is
performed by the lungs, liver, kidneys, skin, and mucous membrane.

Each organ and tissue possesses the power to repair itself. Animal heat,
which is also necessary to life, is not produced by any special set
of organs, but results incidentally from the various other processes
named.

The Reproductive Apparatus.--As there is a stomach to digest, a brain
to think, a pair of lungs to breathe, etc., so there are special organs
for reproducing the species or producing new individuals. These organs
have been