Discusses classification of animals. Degree of affinity different for different taxonomic groups. Discusses affinity of Ornithorhynchus or Echidna to reptiles.
Brain of whale is highly developed; on differences among brains of Quadrumana.
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Discusses classification of animals. Degree of affinity different for different taxonomic groups. Discusses affinity of Ornithorhynchus or Echidna to reptiles.
Brain of whale is highly developed; on differences among brains of Quadrumana.
Explains what he means when he attempts a "natural classification", defining his words and using man as a standard; gives examples. Classification of Aptera and Diptera.
Discusses his discharge from the Zoological Society. Is to see Robert Brown about the British Museum position.
Classification consists of grouping beings according to descent from common stocks. Analogies are resemblances between forms not inherited from common stocks. Neither number of species nor grade of organisation should be considered in classification. Admits that caution is necessary in admitting a few species to form a group of rank equal to one containing many species.
Has no objection to uniting Monotremata and other marsupials but would object to doing so solely on ground that Monotremata consists of only two species. Members of a natural group need not share common character so long as they are linked with those which do. Believes that if every organism that ever lived were collected, a perfect series would be presented. What are reasons that unite Aptera and Diptera?