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UNIVERSITY EXTENSION MANUALS

EDITED BY PROFESSOR KNIGHT

THE STUDY OF ANIMAL LIFE

EDITOR'S PREFACE

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This Series is primarily designed to aid the University Extension Movement throughout Great Britain, and to supply the need so widely felt by students, of Text-books for study and reference, in connection with the authorised Courses of Lectures.

The Manuals differ from those already in existence in that they are not intended for School use, or for Examination purposes; and that their aim is to educate, rather than to inform. The statement of details is meant to illustrate the working of general laws, and the development of principles; while the historical evolution of the subject dealt with is kept in view, along with its philosophical significance.

remarkable success which has attended University Es ion in Britain has been partly due to the combination of scientific treatment with popularity, and to the union of simplicity with thorough

This movement, however, can only reach those resident in the larger centres of population, while all over the country there are thoughtful persons who desire the same kind of teaching. It is for them also that this Series is designed. Its aim is to supply the general reader with the same kind of teaching as is given in the Lectures, and to reflect the spirit which has characterised the movement, viz. the combination of principles with facts, and of methods with results.

The Manuals are also intended to be contributions to the Literature of the Subjects with which they respectively deal, quite apart from University Extension ; and some of them will be found to meet a general rather than a special want.

They will be issued simultaneously in England and America. Volumes dealing with separate sections of Literature, Science, Philosophy, History, and Art have been assigned to representative literary men, to University Professors, or to Extension Lecturers connected with Oxford, Cambridge, London, and the Universities of Scotland and Ireland.

A list of the works in this Series will be found at the end of the volume.

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Animal Life

BY

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ARTHUR THOMSON, M.A., F.R.S.E.
LECTURER ON ZOOLOGY, SCHOOL OF MEDICINE, EDINBURGH

JOINT-AUTHOR OF 'THE EVOLUTION OF SEX'

AUTHOR OF OUTLINES OF ZOOLOGY

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SECOND EDITION

WITH ILLUSTRATIONS

LONDON

JOHN MURRAY, ALBEMARLE STREET

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