Studies on Fermentation: The diseases of beer, their causes, and the means of preventing themPasteur, Louis
Science
Studies on Fermentation: The diseases of beer, their causes, and the means of preventing them
Pasteur, Louis
Beer; Fermentation
Now what bearing on this purely imaginary theory can the fact have, that
a whole fruit, immersed in carbonic acid gas, immediately produces
alcohol and carbonic acid? In the preceding passage, which we have
borrowed from M. Fremy, an indispensable condition of the transformation
of the albuminous matter is the contact with air and the crushing of the
grapes. Here, however, we are dealing with _uninjured fruits in contact
with carbonic acid gas_. Our theory, on the other hand, which, we may
repeat, we have advocated since 1861, maintains that all cells become
fermentative when their vital action is protracted in the absence of
air, which are precisely the conditions that hold in the experiment on
fruits immersed in carbonic acid gas. The vital energy is not
immediately suspended in their cells, and the latter are deprived of
air. Consequently, fermentation must result. Moreover, we may add, if we
destroy the fruit, or crush it before immersing it in the gas, it no
longer produces alcohol or fermentation of any kind, a circumstance that
may be attributed to the fact of the destruction of vital action in the
crushed fruit. On the other hand, in what way ought this crushing to
affect the hypothesis of hemi-organism? The crushed fruit ought to act
quite as well, or even better than that which is uncrushed. In short,
nothing can be more directly opposed to the theory of the mode of
manifestation of that hidden force to which the name of hemi-organism
has been given, than the discovery of the production of these phenomena
of fermentation in fruits surrounded with carbonic acid gas; whilst the
theory, which sees in fermentation a consequence of vital energy in
absence of air, finds in these facts the strictest confirmation of an
express prediction, which from the first formed an integral part of its
statement.
We should not be justified in devoting further time to opinions which
are not supported by any serious experiment. Abroad, as well as in
France, the theory of the transformation of albuminous substances into
organized ferments had been advocated long before it was taken up by M.
Fremy. It no longer commands the slightest credit, nor do any observers
of note any longer give it the least attention; it might even be said
that it has become a subject of ridicule.
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