General Principles of Zoology (Classic Reprint)

First orG eneral Part of Professor Richard Hertwig sL ehrbuch der Zoologie, which embodies the results of his long and eminently successful experience in teaching. The translation has been made with his consent and active cooperation and thus really constitutes a fourth edition. When theL ehrbuch was prepared, the author did not contemplate the contingency of a separate publication of the General Part, but it is believed that his masterly treatment of the larger generalizations of the subject will be of service by itself to teacher, student, and general reader. The term Anlage has been rendered rudiment, in the sense that rudimentary organs are such as are in process of development. Conversely, organs in process of disappearance are termed vestigeal organs. The adjective vegetal, as corresponding with animal, has been used in preference to vegetative ;e.g., the vegetal and the animal pole of the egg. It is too much to hope that errors have not crept in, and as the most satisfactory text-books result from the cooperation of many workers, the editor invites such corrections and suggestions as may tend to widen the usefulness of the work. In reading proof much assistance has been given by Miss Ada G. Wing, a graduate student of Biology in Brown University, and to her the translator is indebted for many valuable suggestions. G. W. F.
(Typographical errors above are due to OCR software and don't occur in the book.)

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