The science of hygiene : a text-book of laboratory practice for public health students

Front matter

THE SCIENCE OF HYGIENE

W. C.C.PAKES & A.T. NANKWELL

Pass "RA 4 30 Book \

Preface To The Revised Edition

THIS book is intended for the use of students who are working for a diploma in public health ; and it is hoped that they will find it useful not only before their examinations, but afterwards, should they happen to work again in public health laboratories.

When I was working for my D.P.H. I found the first edition of Dr. Pakes' book more valuable than any other text-books on laboratory work : the arrangement of the subject matter was simple and concise, there was no unnecessary overlapping, and what the Author had to say he said plainly and directly. I have tried, in this new edition, to attain the same standard of excellence.

All the practical laboratory work, apart from bacteriological methods, required by D.P.H. students, is included in this volume ; and no effort has been spared to make the book complete. Many modern text-books have been consulted ; but nothing has been merely transferred from these.

The first edition of this book contained chapters on physics, bacteriology, and vital statistics. It was felt, however, that such subjects were better treated in other, and necessarily larger, books ; and that much of these sciences could hardly be considered as laboratory work. For these reasons, no part of this volume is devoted to these subjects.

On the other hand, many additions have been made, and much of the text has been re-written.

vi THE SCIENCE OF HYGIENE

The illustrations in this volume, which appeared also in the first edition, are the admirable work of Dr. T. G. Stevens.

My thanks are especially due to Dr. A. J. Malcolm, my fellowdemonstrator in the Public Health Laboratories of King's College, for his help and suggestions.

A. T. N.

King's College

Contents

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i

Interpretation of Results .