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days. Did the genetic power then wait for the disappear-
ance of this swan's neck in order to manifest itself?
What is your explanation worth in the presence of this:
the curves of the neck, remaining moist at the moment
when the fire was extinguished, washed in its passage the
air which traversed them in a thin thread? In the
beginning when the entrance of the air was rapid, the
purifying action of this washing was doubled by that of


FIG. 12. --Swan-neck flank used by Pasteur in his study of spontaneous
generation.

the liquid, still hot and able to destroy the germs which
came in contact with it. Later, the wet. walls of the
neck have held fast the germs of the air as they have
passed through the narrow opening. The proof of this
is that if you shake the flask in such a way as to introduce
into the curve of the neck a little drop of the infusion,
having previously closed the open end so that nothing
new will enter, this drop becomes clouded, and if you
then mix this drop with the rest of the liquid, the latter

-99-

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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: 99.
    
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