I. 4th Edition, revised and enlarged. MANUAL OF ZOOLOGY, FOR THE USE OF STUDENTS. WITH A GENERAL INTRODUCTION ON THE PRINCIPLES OF ZOOLOGY. Crown 8vo, pp. 752, with 300 Illustrations engraved on Wood, 12s. 6d. II. TEXT BOOK OF ZOOLOGY, FOR THE USE OF SCHOOLS. 2d Edition, enlarged. Crown 8vo, with 188 Engravings on Wood, 6s. III. OUTLINES OF NATURAL HISTORY, FOR BEGINNERS. BEING DESCRIPTIONS OF A PROGRESSIVE SERIES OF ZOOLOGICAL TYPES. Fcap. 8vo, with Engravings, Is. 6d. IV. A MANUAL OF PALEONTOLOGY, FOR THE USE OF STUDENTS. WITH A GENERAL INTRODUCTION ON THE PRINCIPLES OF PALEONTOLOGY. Crown 8vo, with upwards of 400 Engravings, 15s. V. A MONOGRAPH OF THE BRITISH GRAPTOLITIDÆ. Octavo, with Engravings, 5s. VI. INTRODUCTION TO THE STUDY OF BIOLOGY. Crown 8vo, with numerous Engravings, 5s. WILLIAM BLACKWOOD & SONS, EDINBURGH AND LONDON. PREFACE TO THE FIRST EDITION. THE object of this work is to serve as an Introduction to the larger works by the Author upon the same subject. It The same general plan has been followed as in the 'Advanced Text-Book'-that is to say, more space has been devoted to the Invertebrate Animals than has usually been the case in Introductory works on Zoology. As a result of this, it will perhaps appear to some that comparatively scanty justice has been done to the Vertebrata. is to be remembered, however, that the Vertebrate Animals are of no greater zoological value or interest than any other of the primary divisions of the Animal Kingdom; and the limits of this work peremptorily forbid the introduction of anything beyond purely scientific matter, if each sub-kingdom is to receive its proper quota of description. The style of the work has been as entirely freed from technicalities as possible, and most of those subjects have been omitted which require a previous acquaintance with the elements of Physiology, since the work is intended to be nothing more than an Introduction to Systematic Zoology. |