Excerpt from General Principles Zoology
This volume comprises the First or General Part of Professor Richard Hertwig"s "Lehrbuch 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 the "Lehrbuch" 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.
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