PREFACE TO THE FIRST EDITION 



The present volume is the product of some years' experience 

 in developing an introductory course in zoology designed to 

 meet the needs of general college students and at the same time 

 to satisfy the technical requirements of various groups of pre-pro- 

 fessional students, especially those preparing for medicine. 

 The foundation for such a course must be laid in the actual study 

 of animal forms in the laboratory but the limitation in time pre- 

 cludes the presentation and demonstration of many important 

 and interesting aspects of the subject by the usual laboratory 

 methods. For this reason the author, sharing the experience of 

 others, has found it advisable to devote two or three lecture or 

 recitation periods weekly to the enlargement and rounding out 

 of the student's knowledge of the subject by class-room discus- 

 sions of those phases of zoology not adequately dealt with in the 

 laboratory. The problem of a suitable text for this work has 

 been met by the compilation of the contents of this book, which is 

 a rather condensed account of some of the outstanding facts and 

 principles of zoology, selected and arranged to serve the student 

 as a guide; the form of the text having been kept as flexible as 

 possible to permit of expansion or extension in whatever direc- 

 tion the instructor may see fit. The references listed at the end 

 of each chapter are easily available works which the author has 

 been in the custom of assigning for collateral reading. 



The book begins with a consideration of such general topics 

 as morphology and physiology, the protoplasmic doctrine, the 

 cell doctrine, taxonomy and adaptation; followed by an outline 

 of organology illustrated by examples from common laboratory 

 animals, considered largely from the morphological side. Then 

 follows a section dealing primarily with the functional side of 

 the animal organism, centering in metabolism. Next come the 

 main facts of ontogenesis, followed in turn by a discussion of 

 phylogenesis, evolution and heredity. To cover this ground 

 takes the greater part of a year, the remainder of which is devoted 

 to a general survey of the animal kingdom, as outlined in the final 

 chapter, paying particular attention to life histories and the sys- 

 tematic side of zoology, which the author believes should form 



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