Transcriber's note: Text enclosed by underscores is in italics (_italics_).
A single underscore introduces a subscript (CO_2), and a caret a
superscript (B^1).
Page numbers enclosed by curly braces (for example: {25}) have been
incorporated to facilitate the use of the Alphabetical Index and other page
references in the text.
* * * * *
THE
CAMBRIDGE NATURAL HISTORY
EDITED BY
S. F. HARMER, Sc.D., F.R.S., Fellow of King's College, Cambridge;
Superintendent of the University Museum of Zoology
AND
A. E. SHIPLEY, M.A., F.R.S., Fellow of Christ's College, Cambridge;
University Lecturer on the Morphology of Invertebrates
VOLUME I
[Illustration]
PROTOZOA
By MARCUS HARTOG, M.A., Trinity College (D.Sc. Lond.), Professor of
Natural History in the Queen's College, Cork
PORIFERA (SPONGES)
By IGERNA B. J. SOLLAS, B.Sc. (Lond.), Lecturer on Zoology at Newnham
College, Cambridge
COELENTERATA & CTENOPHORA
By S. J. HICKSON, M.A., F.R.S., formerly Fellow and now Honorary Fellow
of Downing College, Cambridge; Beyer Professor of Zoology in the Victoria
University of Manchester
ECHINODERMATA
By E. W. MACBRIDE, M.A., F.R.S., formerly Fellow of St. John's College,
Cambridge; Professor of Zoology in McGill University, Montreal
London
MACMILLAN AND CO., LIMITED
NEW YORK: THE MACMILLAN COMPANY
1906
_All rights reserved_
And pitch down his basket before us,
All trembling alive
With pink and grey jellies, your sea-fruit;
You touch the strange lumps,
And mouths gape there, eyes open, all manner
Of horns and of humps.
BROWNING, _The Englishman in Italy_
CONTENTS
PAGE
SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK ix
PROTOZOA
CHAPTER I
PROTOZOA—INTRODUCTION—FUNCTIONS OF PROTOPLASM—CELL-DIVISION—ANIMALS
AND PLANTS 3