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H Y GIENE
A Practical Manual for Students,
Physicians, and Health-Officers
Bacteriology. University of Pennsylvania
FIFTH EDITION, THOROUGHLY REVISED
PHILADELPHIA AND LONDON
Copyright, 1901, by W. B. Saunders and Company. Revised, reprinted, and
Copyright, 1914, by W. B. Saunders Company.
PRINTED IN AMERICA
.-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.
OCT 1 1 1950