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An extinct Animal recognized by its Tooth : how came this to be possible ?-The Task of Classification.-Artificial and natural Methods.-Linneeus, and hisBaptismof the Animal Kingdom: his Scheme of Classification.-What is there underlying all true Classification ?-The chief Groups.-What is a Species ?-Restatement of theQuestionrespecting the Fixity or Variability of Species.-The two Hypotheses.-Illustrationdrawn from the Romance Languages.-Caution to Disputants Page 86 CHAPTER V. Talking in Beetles.-Identity of Egyptian Animals with those now existing : Does this prove Fixity of Species ?-Examination of the celebrated Argument of Species not having altered in four thousand Years.-Impossibility of distinguishing Species from Varieties.-The Affinities of Animals.-New Facts proving the Fertility of Hybrids.-TheHare and the Rabbit contrasted.-Doubts respecting the Development Hypothesis.-On Hypoth- esis in Natural History.-Pliny, and his Notion on the Formation of Pearls.-ArePearls owing to a Disease of the Oyster ?-Formation of the Shell ; Origin of Pearls.-How the Chinese manufacture Pearls 107 CHAPTER VI.Every Organism a Colony.-What is a Paradox ?-An Organ is an independent Individual and a dependent one.-A Branch of Coral.-A Colony of Polypes.-The Siphonophora.-Uni-versal Dependence.-Youthful Aspirings.-Our Interest in the Youth of great Men.-Genius and Labor.-Cuvier's College Life ; his Appearance in Youth ; his Arrival in Paris.-Cuvier and Geoffroy St.Hilaire.-Causes of Cuvier's Success.-One of his early Ambitions.-M.le Baron.
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