1929 · Alexander Fleming
On the Antibacterial Action of Cultures of a Penicillium
What this work is
A laboratory paper reporting that a mould contaminant on a staphylococcus culture plate had dissolved the colonies around it. Fleming grew the mould in broth, filtered it, and tested the filtrate against a range of bacteria, recording which were inhibited and which were not. He reports the filtrate did not harm white blood cells or animals, and suggests it as a tool for isolating certain bacteria in culture and possibly as an antiseptic for wounds.
Verdict
UNSCIENTIFIC
The work follows the scientific method inside its paradigm. The paradigm itself does not pass. The verdict is unscientific.
1·This work · inside the paradigm
SCIENTIFIC
Follows the scientific method within Germ Theory. Shows how the conclusion was built; does not change the verdict.
2·Paradigm · Germ Theory
UNSCIENTIFIC
Fails the tests. This decides the verdict.
How the verdict is decided
The verdict grades the whole picture: the paradigm this work assumes, and how the work was carried out inside it. A work can follow the scientific method rigorously and still be unscientific, because rigor inside a paradigm only shows the conclusion was reached carefully. It cannot verify the premise the paradigm rests on. So the paradigm decides the verdict. The work’s own score is kept because it shows how the conclusion was built.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
SCIENTIFIC
A mould contaminant produces a substance in liquid culture that stops certain bacteria from growing and dissolves them, and this substance can be used to separate one type of bacteria from another on culture plates. All three tests pass.
Independently Verifiable
Pass
Fleming saw colonies vanish around a mould with his own eyes, and anyone who rejects germ theory can still watch broth go from cloudy to clear when the mould liquid is added.
Falsifiable
Pass
The design let nothing happen, and nothing did happen for B. coli, B. typhosus, and every other mould tested except the one contaminant, so the claim could have produced no effect and reported it.
Non-Circular
Pass
The mould landed on the plate by accident, the detection method is watching whether colonies grow or not, and the control is colonies growing without the mould liquid, so nothing in the setup presupposes the conclusion.
Why
Fleming left culture plates on his bench and a mould contaminant grew on them. He noticed that colonies near the mould became transparent and disappeared. He grew the mould in broth and tested the broth against dozens of microorganisms by streaking them on agar plates and watching whether they grew. Some stopped growing. Some dissolved. Some were completely unaffected. He diluted the broth serially and measured how far the clearing extended. He boiled it, filtered it, and tested its solubility in alcohol and ether. Every step produced a visible result: colonies present or absent, broth cloudy or clear, a zone of inhibition wide or narrow. The mould was not designed from a theory. It was a contaminant. The observation did not require the germ theory framework to be visible. A person who has never heard of pathogenic bacteria can still see that something in that liquid stops things from growing on a plate. The control was the same plate without the liquid, and the colonies grew fine there. The claim could have died on the first plate if nothing had happened, and it did die for most of the bacteria tested and for every other mould he tried.
2·Paradigm · Germ Theory
Does the framework this work assumes pass the three tests?
UNSCIENTIFIC
Independently Verifiable
Fail
The paper labels certain bacteria 'pathogenic' and others not based on the germ theory framework, and that classification is not independently verifiable by someone who rejects the model.
Falsifiable
Fail
If the mould liquid had failed to kill any bacteria, the framework would not have been questioned, only this particular mould, because the model never puts its own premise that bacteria cause disease at risk.
Non-Circular
Fail
The bacteria were identified and classified as pathogenic or non-pathogenic using culture and staining methods that presuppose the germ theory model, and those classifications were then used to interpret which results mattered.
Why
Fleming's specific observations are visible and real. The framework around them is not. The paper sorts bacteria into 'pathogenic' and 'non-pathogenic' categories using methods that assume the germ theory model, then reports which category the mould liquid affects. The model supplies the meaning of 'pathogenic' before the experiment runs. If the mould liquid killed nothing, nobody would conclude that bacteria do not cause disease. They would conclude this particular mould produces nothing useful. The framework has absorbers for every failure: the wrong bacteria, the wrong conditions, the wrong mould. The terrain distinction applies directly. The model treats bacteria as the problem and killing them as the solution. It does not ask why the bacteria are there, what conditions allowed them to proliferate, or what state of the host made growth possible. The body's response to underlying damage is ignored. The bacteria are named as the disease, and dissolving them is called a cure. Fleming watched something real happen on a plate. The framework he worked inside tells him what it means, and that meaning was never tested by this paper.
From the work
It was noticed that around a large colony of a contaminating mould the staphylococcus colonies became transparent and were obviously undergoing lysis
Of these it was found that only one strain of penicillium produced any inhibitory substance, and that one had exactly the same cultural characters as the original one from the contaminated plate.
the name 'penicillin' will be used. This will denote the filtrate of a broth culture of the particular penicillium with which we are concerned.
Source
On the Antibacterial Action of Cultures of a Penicillium
Alexander Fleming
1929 · Primary work
Scored from primary work · Rubric 1.0