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COPYRIGHT, 1910, BY LUTHER H. GULICK

ENTERED AT STATIONERS' HALL

ALL RIGHTS RESERVED

A924.6

THE GULICK HYGIENE SERIES

FIVE-BOOK SERIES

Book 1. Good Health

Book II. Emergencies
Book III. Town and City
Book IV. The Body at Work
Book V. Control of Body and Mind

TWO-BOOK SERIES

Health and Safety
Physiology, Hygiene, and Sanitation

The Body ang its Defenses

Che Athen æum Press
GINN AND COMPANY. PRO-
PRIETORS · BOSTON. U.S.A.

INTRODUCTION

In the following pages emphasis is laid on function rather than on structure, on bodily health rather than on the mere mechanical operation of bone, muscle, gland, and tissue. So much of structure is, however, included as is necessary to show that we are personally responsible for the kind of service which we receive from the organs of the body; and that we are equally responsible for the habits of bone and muscle which determine the physical representation of ourselves to others.

Attention is drawn to right and wrong habits of sitting, of standing, and of walking; to the relation of the school desk to spinal curvature; to laws of growth, through the knowledge of which correct habits of posture may be secured; to the value of physical exercise as an aid to general health; to the development of muscular vigor and to the renewal of tissue through food and exercise.

By natural transition the work of the muscles leads to a study of the source of their energy, — the blood. Simple tests, easily applied, acquaint the reader with the cause of rapid and slow heart beat, with methods of training the heart to increased power, with reasons

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