Excerpt from Textbook of Zoology
In writing this volume the authors have adopted the "type-system" as being most suitable to their purpose. The advantages of this system as an introduction to the natural history sciences are well known, though there are dangers attaching to the too exclusive restriction of the attention to isolated species; an endeavour has therefore been made throughout the writing of this work to keep both the advantages and the dangers in mind.
An experience of several years in conducting correspondence-classes in the subject has made the authors aware (to a greater extent, probably, than most ordinary teachers) of the wonderful way in which misunderstandings can lurk in the seemingly plainest sentences, and accordingly great pains have been taken to make their meaning clear at all points. Only one chapter in the book (Chapter XIV.) remains practically unaltered from the first edition, so that while the credit for the general plan of the work belongs to Mr. H. G. Wells, no responsibility attaches to him for any part of the present book.
The diagrams have been drawn specially for the book by Mrs. Davies, and it is hoped the plan adopted for labelling them will be useful to students.
Thanks are due to Mr. J. M. Lowson, M.A., B.Sc., who has read through both the manuscript and proofs, and made many valuable suggestions; also to Mr. E. Stenhouse for having called attention to several slips and errors.
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