Chapter VII: Preface: v (6)

Within the past decade there has been a tendency for teachers of zoölogy to pay less attention to morphology and more to physiology. As a prominent morphologist recently said, “Morphology ... is no longer in favor ... and among a section of the zoölogical world has almost fallen into disgrace” (Bourne). The study of the form and structure of animals is, however, of fundamental importance, and is absolutely necessary before physiological processes can be fully understood; but a course which is built up on the “old-fashioned morphological lines” is no longer adequate for the presentation of zoölogical principles.

The present volume has not been made by merely adding a description of the vertebrates to the author’s “Introduction to Zoölogy” (for a brief account of which see the last pages of this circular). On the contrary, it is a new work throughout, although the same general method of treatment, which proved so successful in the earlier book, has been employed in this one. Similarly, in the preparation of this book the author has submitted the manuscript of each chapter to a scholar and teacher of unquestioned authority in the particular field. The criticisms and suggestions thus secured have greatly increased both the accuracy and the practicability of the text.

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An Introduction to Zoölogy

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ROBERT W. HEGNER, Ph.D.

Instructor in Zoölogy in the University of Michigan

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Only a few animals belonging to the more important phyla, as viewed from an evolutionary standpoint, are considered. They are, however, intensively studied in an endeavor to teach the fundamental principles of Zoölogy in a way that is not possible when a superficial examination of types from all the phyla is made. Furthermore, morphology is not specially emphasized, but is coördinated with physiology, ecology, and behavior, and serves to illustrate by a comparative study the probable course of evolution. The animals are not treated as inert objects for dissection, but as living organisms whose activities are of fundamental importance. No arguments are necessary to justify the “type course,” developed with the problems of organic evolution in mind, and dealing with dynamic as well as static phenomena.

“I have read your chapter (The Crayfish and Arthropods in General) and can express my satisfaction with reference to the general arrangement of the matter, as well as with reference to the detail. The whole treatment is up to date, taking account of the modern advancement in our knowledge of the crayfishes, and, chief of all, the more important features in the natural history of these animals are very properly separated from the unimportant ones. I think this chapter gives the essence of what we know about crayfishes, and any student might use the book advantageously. In fact, I know no other text-book which gives such a wealth of information upon so few pages.”--Professor A. E. ORTHMANN, Carnegie Museum.

“The plan is very satisfactory, and the book will be very instructive for class use. I am very glad that you have chosen the bee as your insect type.” (Chapter XII.)--Dr. E. E. PHILLIPS, Department of Agriculture, Washington, D.C.

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Household Bacteriology

BY

ESTELLE D. BUCHANAN, M.S.

Recently Assistant Professor of Botany, Iowa State College

AND

ROBERT EARLE BUCHANAN, PH.D.

Professor of Bacteriology, Iowa State College, and Bacteriologist of
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The word Household is used as an extension rather than a limitation of the title. In a thoroughly scientific manner the authors treat the subject-matter of general as well as of household bacteriology and include, therefore, the true bacteria as well as the yeasts, molds, and protozoa. The volume is, therefore, a general textbook of micro-biology in which special attention is given to those problems which are of particular interest to the student of household science. The main divisions of the book treat (1) the micro-organisms themselves, (2) fermentations with special reference to those affecting foods, (3) the relations of bacteria and other micro-organisms to health. A fully illustrated key (comprising 37 pages) to the families and genera of common molds, supplements the unusually extended discussion of the morphology and classification of yeasts and molds, and makes possible the satisfactory identification of all forms ordinarily encountered by the student. The work embodies the results of the most recent researches. The book is exceptionally well written, the different topics are treated consistently and with a good sense of proportion. While concise in statement, it is thorough in method and scope. It is, therefore, well adapted for use as a text not only _for students of household science_, but _also_ for those to whom it is desired to present the science of bacteriology from _an economic and sanitary rather than from a strictly medical point of view_.

“The book is a concisely written work on micro-biology, a branch of economic science that the public is beginning gradually to understand, has important relationship to the total welfare and prosperity of the community.... The manual can be recommended as a very good elementary bacteriology. It comprises about all there is of practical domestic value.”--_Boston Advertiser._

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A Laboratory Guide to the Study of Parasitology

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