nunciation indicated, so that it is not thought necessary to append a
glossary.

4. To present the subjects of Physiology and Hygiene in the light of
the most recent authentic researches in these branches of science, and
to avoid the numerous errors which have for many years been current in
the school literature of these subjects.

There is no subject in the presentation of which object-teaching may be
employed with greater facility and profit than in teaching Physiology,
and none which may be more advantageously impressed upon the student's
mind by means of simple experimentation than the subject of Hygiene.
Every teacher who uses this book is urgently requested to supplement
each lesson by the use of object-teaching or experiments. A great number
of simple experiments illustrative of both Physiology and Hygiene may be
readily arranged. Many little experiments are suggested in the text,
which should invariably be made before the class, each member of which
should also be encouraged to repeat them at home.

It is also most desirable that the teacher should have the aid of
suitable charts and models.

In conclusion, the author would acknowledge his indebtedness for a large
number of useful suggestions and criticisms to several medical friends
and experienced teachers, and especially to Prof. Henry Sewall, of the
University of Michigan, for criticisms of the portions of the work
relating to Physiology.

CONTENTS.

CHAPTER PAGE

TO THE TEACHER iii

I. THE HOUSE WE LIVE IN 1

II. A GENERAL VIEW OF THE BODY 5

III. THE INSIDE OF THE BODY 7

IV. OUR FOODS 11

V. UNHEALTHFUL FOODS 14

VI. OUR DRINKS 19

VII. HOW WE DIGEST 27

VIII. DIGESTION OF A MOUTHFUL OF BREAD 35

IX. BAD HABITS IN EATING 39

X. A DROP OF BLOOD 46

XI. WHY THE HEART BEATS 48

XII. HOW TO KEEP THE HEART AND THE BLOOD HEALTHY 56

XIII. WHY AND HOW WE BREATHE 63

XIV. HOW TO KEEP THE LUNGS HEALTHY 75

XV. THE SKIN AND WHAT IT DOES 81

XVI. HOW T