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TWENTIETH CENTURY TEXT-BOOKS

EDITED BY

A. F. NIGHTINGALE, Ph.d., LL.D.

SUPERINTENDENT OF SCHOOLS, COOK COUNTY, ILLINOIS
FORMERLY SUPERINTENDENT OF HIGH SCHOOLS, CHICAGO

ANIMAL STUDIE

A TEXT-BOOK OF ELEMENTARY ZOOLOGY
FOR USE IN HIGH SCHOOLS AND COLLEGES

By ::

DAVID STARR JORDAN

PRESIDENT OF LELAND STANFORD JR. UNIVERSITY

VERNON LYMAN KELLOGG

PROFESSOR OF ENTOMOLOGY
AND

HAROLD HEATH

ASSOCIATE PROFESSOR OF INVERTEBRATE ZOOLOGY
IN LELAND STANFORD JR. UNIVERSITY

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Copyright, 1903
By D. APPLETON AND COMPANY

Animal Life
Copyright 1900 by D. Appleton and Company

Animal Forms
Copyright 1902 by D. Appleton and Company

EXCHANGE
LIBRARY

STATE COLLEGE
OF WASHINGTON

NOV i 7 >3g

EDITOR'S PREFACE

The publishers are assured from the most expert testimony that they are presenting to the educational public, in this volume, a compact but complete treatment of elementary zoology, especially for those institutions of learning which prefer to find in a single book an ecological as well as a morphological survey of the animal world. Animal Life, in the series, treats largely of ecology, Animal Forms of morphology. In this volume the same authors present the salient features of each of the above-named books, with entirely new and additional chapters on Classification, the Economic Value, and the Ancient History of Animals. In Animal Studies an important advance step is taken toward meeting the demand for an elementary zoology that shall treat of the natural history rather than merely of the morphology of animals. Several new plates not found in the other volumes have been added. The structure, life habits, environments, economics, and history of fossil animals are each treated with that clearness, conciseness, and completeness for which President Jordan is particularly distinguished. While the book contains adequate material for a year's work, it is also admirably adapted for those schools that find it necessary to give a shorter time to this subject. The following ideas expressed by Dr. Coulter concerning

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