O TAKE CARE OF THE SKIN 88

XVII. THE KIDNEYS AND THEIR WORK 91

XVIII. OUR BONES AND THEIR USES 93

XIX. HOW TO KEEP THE BONES HEALTHY 100

XX. THE MUSCLES, AND HOW WE USE THEM 105

XXI. HOW TO KEEP THE MUSCLES HEALTHY 109

XXII. HOW WE FEEL AND THINK 115

XXIII. HOW TO KEEP THE BRAIN AND NERVES HEALTHY 126

XXIV. BAD EFFECTS OF ALCOHOL UPON THE BRAIN AND
NERVES 130

XXV. HOW WE HEAR, SEE, SMELL, TASTE; AND FEEL 138

XXVI. ALCOHOL 154

QUESTIONS FOR REVIEW 170

FIRST BOOK
OF
PHYSIOLOGY AND HYGIENE.

CHAPTER I.

THE HOUSE WE LIVE IN.

~1. Object of this Book.~--The object of this book is to tell the little
boys and girls who read it about a wonderful house. You have all seen
some very beautiful houses. Perhaps they were made of brick or stone,
with fine porches, having around them tall shade trees, smooth lawns,
pretty flower-beds, walks, and sparkling fountains.

~2.~ Perhaps some of you live in such a house, or have visited some
friend who does. If so, you know that the inside of the house is even
more beautiful than the outside. There are elegant chairs and sofas in
the rooms, rich carpets and rugs on the floors, fine mirrors and
beautiful pictures upon the walls--everything one could wish to have in
a house. Do you not think such a house a nice one to live in?

~3. The Body is Like a House.~--Each of us has a house of his own which
is far more wonderful and more curious than the grandest palace ever
built. It is not a very large house. It has just room enough in it for
one person. This house, which belongs to each one of us, is called the
body.

~4. What is a Machine?~--Do you know what a machine is? Men make
machines to help them work and to do many useful things. A wheelbarrow
or a wagon is a machine to carry loads. A sewing-machine helps to make
garments for us to wear. Clocks and watches are machines for keeping
time.

~5. A Machine has Different Parts.~--A wheelbarrow has a box in which to
carry things, two handles to hold by, and a wheel for rolling it along.
Some machines, like wheelbarrows and wagons, have but few parts, and it
is very easy for us to learn how they work. But there are other
machines, like watches and sew