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_INTRODUCTION._
1. Animals are natural bodies which possess organization, life, sensation,
and voluntary motion; and ZOOLOGY is that branch of natural science which
treats of their systematic arrangement; their structure and functions;
their habits of life, instincts, and uses to mankind.
2. The objects comprehended within the animal kingdom are divided into six
classes: of Mammalia or Mammiferous Animals, Birds, Amphibia or Amphibious
Animals, Fishes, Insects, and Worms: which are thus distinguished: