1876 · Louis Pasteur
Études sur la bière
What this work is
A book on brewing. Pasteur argues that yeast is a living organism responsible for fermentation, that beer spoils because foreign microscopic organisms arrive with airborne dust, and that beer will keep if the wort is heated, shielded from dust, and seeded with pure yeast. He describes flask experiments in which protected wort stayed sound while exposed wort turned, and lays out a brewing process built on those results.
Then and now
Pasteur showed that beer seeded with pure yeast kept, while beer with foreign organisms spoiled. Germ theory carried this from flasks to living bodies and cites it as proof that microbes cause disease. His flasks showed spoiling beer, not sick people, and nobody has seen a microbe cause a disease.
Verdict
SCIENTIFIC
The work follows the scientific method and does not operate inside a theoretical framework. The verdict is scientific.
1·This work · no theoretical framework
SCIENTIFIC
Follows the scientific method. No theoretical framework attached.
2·Paradigm · Basic Epidemiological Comparison
NOT APPLICABLE
No theoretical framework. The study verdict decides.
How the verdict is decided
This work does not operate inside a theoretical framework. Using hospital records, billing codes, or diagnostic names as labels on visible events is not the same as depending on that framework. The verdict is the work methodology score alone.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
SCIENTIFIC
This work claims that beer brewed from a pure yeast seed never spoils, while any trace of foreign microscopic organisms in the seed always makes the beer sick, each kind causing its own disease. All three tests pass.
Independently Verifiable
Pass
Every record here, the rising foam, the sour and putrid tastes, and the shapes under the lens, is there for any stranger to see or taste.
Falsifiable
Pass
One pure-seeded flask going sour with free air moving through its neck would have handed the spontaneous-generation side the victory, and the design lets that result appear.
Non-Circular
Pass
The seed's purity was judged under the microscope and the beer's health by tongue and nose, so no instrument grades its own output.
Why
Foam, sour and putrid tastes, and shapes under the lens are there for anyone to see or taste. One pure-seeded flask going sour with air moving through its neck would have handed the win to the other side. Purity was judged under the lens and the beer's health by tongue and nose, so no instrument graded its own output.
2·Paradigm · Basic Epidemiological Comparison
The three tests do not apply. There is no theoretical framework.
NOT APPLICABLE
Why
There is no theoretical framework under this method. Pasteur boiled a liquid, kept dust away with glassware and flame, seeded it, and watched what happened to the taste. A rival who believed that liquids organize themselves could run the same flasks and taste the same beers, and the result would mean the same thing to him. The idea that germs cause spoilage came from germ theory, but the test never needed germ theory to run, and the conclusion is only what the flasks showed: seeded one way they stay sound, seeded another way they turn. What the field later built on this work does not enter the grade.
From the work
Après avoir passé rapidement la flamme d'une lampe à alcool sur le tube de caoutchouc, sur le bouchon de verre, sur le tube recourbé, voire même sur les doigts de l'opérateur, on sort le bouchon de verre, et l'on introduit la levure pure à l'aide d'un tube de verre préalablement chauffé.
Cette bière peut se conserver indéfiniment dans le ballon sans jamais s'altérer... elle ne devient ni sûre, ni aigre, ni amère, ni putride.
L'absence d'organismes microscopiques étrangers à la levure de bière correspond invariablement à une bière saine... à la présence de ces organismes correspond toujours une bière malade.