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THE PRINCIPLES

OF

3827

H Y GIENE

A Practical Manual for Students,

Physicians, and Health-Officers

BY
D. H. BERGEY, A.M., M.D.
First Assistant, Laboratory of Hygiene, and Assistant Professor of

Bacteriology. University of Pennsylvania

ILLUSTRATED

FIFTH EDITION, THOROUGHLY REVISED

PHILADELPHIA AND LONDON
W. B. SAUNDERS COMPANY

1914

Copyright, 1901, by W. B. Saunders and Company. Revised, reprinted, and
recopyrighted June, 1904. Reprinted May, 1906. Revised, reprinted,
and recopyrighted January, 1909. Reprinted May, 1910.
Revised, reprinted, and recopyrighted January, 1912.
Revised, reprinted, and recopyrighted

September, 1914.

Copyright, 1914, by W. B. Saunders Company.

PRINTED IN AMERICA

PRESS OF
W. B. SAUNDERS COMPANY

PHILADELPHIA

.-425 339 1914

PREFACE TO THE FIFTH EDITION.

The subjects which have been considered in this book are practically all undergoing marked changes, so that it becomes necessary from time to time to revise statements which embodied our knowledge a few years ago. In the present edition the attempt has been made to bring the subject matter up to date as far as possible. It is not an easy task to keep in touch with all the various lines of investigation and administration which engage the attention of the men in the laboratory as well as those in the field.

The helpful reviews of the fourth edition have aided materially in directing the revision, and grateful acknowledgment is made for the valuable criticisms expressed by the reviewers.

D. H. B. September, 1914.

7

118219

OCT 1 1 1950

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