TWENTIETH CENTURY TEXT-BOOKS EDITED BY A. F. NIGHTINGALE, PH. D., LL.D. SUPERINTENDENT OF SCHOOLS, COOK COUNTY, ILLINOIS ANIMAL STUDIES A TEXT-BOOK OF ELEMENTARY ZOOLOGY BY DAVID STARR JORDAN PRESIDENT OF LELAND STANFORD JR. UNIVERSITY VERNON LYMAN KELLOGG PROFESSOR OF ENTOMOLOGY AND HAROLD HEATH ASSOCIATE PROFESSOR OF INVERTEBRATE ZOOLOGY COPYRIGHT, 1903 BY D. APPLETON AND COMPANY Animal Life Copyright 1900 by D. Appleton and Company · Copyright 1902 by D. Appleton and Company 591 J76a Cop 2 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 admire, adapted for those schools that find it necessary to give a shorter time to this subject. The following ideas expressed by Dr. Coulter concein 1363 |