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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Excerpt from Principles of Animal Biology This book was made necessary by a radical change, several years ago, in the introductory course in zoology at the University of Michigan. When the dissection of animal types in the laboratory was replaced by exercises bearing on the larger questions and fundamental principles of biology, a textbook treating almost exclusively of the morphology of representatives of the phyla, classes and orders was obviously of small use. In the absence of any text which appeared to fit the new departure, a book was provided in temporary form by the organizers of the course. Until now the temporary volume has sufficed. Were a textbook based on principles useful only in a course whose laboratory exercises were also based on principles, the authors would not now feel impelled to make the volume available to others. They have accepted, however, the judgment of other biologists who find that even in courses in which types are dissected in the laboratory, the textbook should deal largely with biological principles, and with classification and the morphology of types only as these subjects fit themselves into the principles of the science as a whole. The best teachers have, in fact, long been presenting to their students much of the material of this book in lectures and recitations. In the hope that a textbook based on principles will be thought better than those now commonly in use, even for courses which retain the dissection of types in the laboratory, this volume is presented to the teachers of zoology and biology. It is believed, furthermore, that the general reader will find in its pages much that is of interest. Illustrations have been selected with a view to making the book intelligible, not only to college students, but to persons who are not pursuing laboratory work. The authors have made no attempt to write in popular style for the benefit of such readers, but have endeavored to make the exposition clear and in the main specific. They prefer to believe that the general reader is willing to labor for his acquisitions so long as his effort promises to yield commensurate results. Advice and criticism have been freely asked and given in the preparation of many of the chapters. The authors desire to mention in particular Professors H. H. Bartlett and J. F. Shepard, Dr. L.V. Heilbrunn, Dr. O. M. Cope, Dr. P. O. Okkelberg and Margaret B. Shull. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

With its focus on the principles of animal biology, Edwin George Potter's Essentials of Zoology is an ideal textbook for both college and high school students. From invertebrates to vertebrates, this book covers all the major groups of animals, with an emphasis on evolution and ecology. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.