This book is a summary of the diversity between and within the classes of animals. It is intended for reference on all aspects of animals that can be studied comparatively, but such comparisons requires that the occurrence of the feature in question beknown for more than just one or two groups. It is in large part a book on invertebrate animals because the vertebrates from only a small part of the diversity of animals.
1. Introduction 2. Origin of Individuals 3. Development of Individuals 4. Adult Individuals 5. Behaviour 6. Coloniality 7. End of existence 8. Classification