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and working as he had done with anthrax blood, Pasteur
saw develop everwhere small non-motile segments of an
extreme tenuity, slightly constricted in the middle ( Fig.
22 ), and clearly approaching, much more than the anthrax
bacteridium and the other bacilli, those microscopic
granules to which Chauveau had attributed the active
rôle in the virulent humors of cowpox, smallpox, and
sheeppox.


Fig. 22. --Microbe of chicken cholera. Young. Old.

This organism is so tenuous that the precipitate which
it forms at the bottom of the flask is sometimes
almost invisible; it appears scarcely to touch the nutri-
tive substances placed at its disposal, and one might
ask himself the question whether it changes in any
respect the culture fluid. "Let us try," said Pasteur
to himself; and he tried, and saw with surprise that if
this bouillon culture was filtered by passing through
a porous wall in order to remove from it all the parasites,
and then re-inoculated, no growth took place. The

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Publication Information: Book Title: Pasteur: The History of a Mind. Contributors: Ėmile Duclaux - author, Erwin F. Smith - transltr, Florence Hedges - transltr. Publisher: W.B. Saunders Company. Place of Publication: Philadelphia. Publication Year: 1920. Page Number: 277.
    
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