The Flea

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 pair...

IN comparing the structure of a flea with that of a man, or any other of the higher animals, it is of the utmost importance to understand that the one has an internal and the ot...

WHEN the outward anatomy of a flea was described, in an earlier chapter, the mouth-parts, which form a sort of beak or proboscis under the head, were mentioned. These most inter...

A FLEA like every other animal must feed and breathe, which leads to a consideration of the internal organs of digestion and respiration. The digestive canal is a slender tube w...

THE human flea (_Pulex irritans_) appears to occupy an isolated position. The genus _Pulex_ which Linnæus established has now been reduced until it contains one species only. Th...

THE chigoes and their allies belong to a group of fleas sufficiently remarkable to deserve a somewhat detailed account. The reader may remember that they form a family to which...

IN order to understand the part played by fleas in the transmission of plague it is necessary to have some clear elementary knowledge of the nature of that disease. Plague is an...

THE chief conclusions arrived at, as the result of the investigations, during the years 1905 to 1909, into the mode of spread of plague in India, may be briefly stated in the fo...