The flea / by Harold Russell.

  • Harold Russell
Date:
1913
Catalogue details

Licence: In copyright

Credit: The flea / by Harold Russell. Source: Wellcome Collection.

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    INTRODUCTORY Fleas form a group of insects that have, until recently, been little studied by zoologists. We call them insects because they are jointed animals, or Arthropods, with three pairs of legs in the adult condition. The reader will best understand the posi- tion which fleas occupy in the general classiflcation of animals by remembering that the arthropods, or jointed animals, are one of a dozen subkingdoms, or phyla, to which the various members of the great animal kingdom have been assigned. There is good ground for believing that all the animals included in each phylum trace their ancestry back to a common primitive form which lived in more or less remote ages. Besides (1) Insects, the arthropods, or jointed animals, include (2) Crustaceans, such as crabs lobsters, shrimps, w6od-lice, water-fleas and bar- nacles; (3) Myriapods, such as centipedes and millipedes; and (4) Arachnids, such as spiders, scor- pions, mites and ticks. To all these varied forms of animal life fleas, and other insects, are therefore more or less nearly related. K. F. 1
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