Chapter 26 … The Third Sin: Discoveries Aren’t Simple

If Kuhn’s first sin was to attack the textbook and his second to remind us that scientists are human, then his third sin is to present as revelatory the obvious truth that scientific discoveries are not simple. This “sin” is perhaps the most galling, for it asks us to accept as a philosophical breakthrough what is, in fact, the barest common sense. Kuhn devotes pages — indeed, entire sections — of The Structure of Scientific Revolutions to the demonstration that discoveries unfold over time, through stages, experiments, failed conjectures, and reconceptualisations. He illustrates the point at tedious length by discussing Joseph Priestley, Antoine Lavoisier, and the supposed “discovery” of oxygen. But his very insistence betrays his weakness: this is not a discovery of Kuhn’s, but a truism so plain as to need no rehearsal.

The Banality of Complexity

Let us begin with the obvious. Who, precisely, ever imagined that the discovery of oxygen was simple? Did Kuhn suppose that we pictured Lavoisier stumbling across oxygen as one might stumble across a lost set of car keys, or as a child might find Wally on the page of a cartoon puzzle? Did he imagine we thought Lavoisier happened upon oxygen behind the sofa, or in the pocket of his waistcoat, ready for immediate identification?

Of course discovery is complex. Of course it involves “to-and-fro experimentation,” as Kuhn puts it, involving conjecture, rejection, refinement, and further testing. Of course there is a process of reconceptualisation, in which the old categories fail and new categories are forged. This is not a revelation but the ordinary logic of inquiry. It would be astonishing if any discovery of significance were otherwise.

The discovery of oxygen was not like Columbus’s first glimpse of the Bahamas, nor like Herschel’s first glimpse of Uranus. It was not geographical, not astronomical, not a mere matter of pointing and declaring. It was a conceptual breakthrough, one that required Lavoisier to abandon the reigning phlogiston theory, to imagine combustion anew, and to convince others that the air itself contained distinct constituents. But who, other than a child, ever imagined that conceptual discovery was like geographical discovery? That anyone needed Kuhn to tell them this is absurd.

Kuhn’s Semantic Tangle: Discovered or Invented?

Much of Kuhn’s handwringing centres upon the semantics of whether oxygen was “discovered” or “invented.” The argument is as follows: Priestley had isolated a gas, described its properties, and called it “dephlogisticated air.” Lavoisier later reinterpreted Priestley’s results in light of his own experiments and called the gas “oxygen.” So was oxygen discovered by Priestley, or invented by Lavoisier, or discovered only once the concept of oxygen was fully formed?

This dilemma is a mere verbal game. It confuses the evolution of language with the evolution of reality. The gas in question existed before either Priestley or Lavoisier touched a retort. The molecules were there, circulating in the atmosphere, sustaining respiration. Priestley did indeed encounter it; Lavoisier did indeed conceptualise it. Both contributed to its recognition. If the historian finds it difficult to assign the laurels, that is not because reality was obscure, but because the historian’s vocabulary is clumsy.

Kuhn himself admits as much: “No wonder historians have had difficulty in dating precisely this extended process that their vocabulary impels them to view as an isolated event.” Exactly. The problem is not with discovery, but with the historian’s vocabulary. The failure is linguistic, not epistemic. Yet Kuhn treats it as a profound paradox, as though the very notion of discovery had collapsed. In reality, the collapse is only in his prose.

Discovery as Process: A Non-Discovery

Let us grant Kuhn’s point for a moment. Suppose discoveries are indeed processes, extended in time, full of hesitation and revision. This, again, is trivial. Does Kuhn think Copernicus published De revolutionibus without decades of calculation? Does he think Darwin wrote On the Origin of Species without years of notebooks, sketches, and correspondence? Does he think Pasteur woke one morning with germ theory fully formed?

Every discovery in science, from Archimedes’ principle to Crick and Watson’s double helix, has been the product of long labour. That is precisely what makes discovery impressive. The genius lies not in the instantaneous finding but in the patient and difficult reconfiguration of evidence, hypothesis, and conceptual framework.

By belabouring this obvious point, Kuhn risks insulting his readers. He explains what no one doubted, and then congratulates himself on the explanation. It is the philosophical equivalent of a man who spends an hour proving that water is wet.

Columbus, Herschel, and the False Analogy

Kuhn’s favourite foil is the “naïve” view that scientific discoveries are like geographical discoveries: a sudden and simple encounter with something previously unknown. But who has ever seriously held this view?

Columbus indeed “discovered” the Americas in the sense of Europeans becoming aware of them. Herschel indeed “discovered” Uranus when it entered the field of his telescope. But even these apparently straightforward cases are less simple than they appear. Columbus thought he had found Asia; Herschel thought he had found a comet. In both cases, the identification of the discovery was a process, requiring correction, reinterpretation, and eventual consensus.

So even the geographical or astronomical discoveries, Kuhn’s supposed paradigm of simplicity, are not simple at all. They too involve error, correction, and debate. The distinction Kuhn wishes to draw collapses under its own weight.

The Historian’s Vocabulary

Where does the supposed paradox lie, then? Not in the world, but in the words. Historians, Kuhn complains, are “impelled” by their vocabulary to treat discovery as an event, a moment, a single date. This, he insists, misleads.

But whose fault is that? If the vocabulary is misleading, change the vocabulary. No one requires the historian to write, “Lavoisier discovered oxygen on Tuesday, June 17th, at 3:42 p.m.” The historian is perfectly free to say, “The discovery of oxygen was a protracted process, involving Priestley, Scheele, and Lavoisier, unfolding between 1770 and 1785.” That is language adequate to reality. The “difficulty” is a manufactured difficulty, the product of Kuhn’s own insistence on treating words as fetters rather than tools.

In fact, one might go further. To claim that historians are trapped by their vocabulary is itself an evasion of responsibility. Language is plastic; words can be refined. If one wishes to distinguish between discovery-as-first-encounter and discovery-as-correct-conceptualisation, one can. To complain that vocabulary makes this impossible is laziness, not philosophy.

Philosophical Inflation

Kuhn’s real sin here is one of inflation: taking a trivial truth and inflating it into a profound theory. Yes, discovery is complex. Yes, naming and conceptualising are different from isolating and observing. Yes, historical narratives sometimes compress long processes into single events. But none of this justifies Kuhn’s grandiose conclusions about paradigms, incommensurability, or the collapse of cumulative science.

To notice that discovery is messy is like noticing that cooking is messy. One does not leap from that to the conclusion that food is socially constructed, or that recipes are incommensurable across cultures, or that eating is a paradigm-bound practice. One concludes only that making a meal takes time and effort.

Kuhn mistakes a banal observation for a philosophical insight. Worse, he then uses that non-insight as a lever to move an entire theory of science. This is intellectual dishonesty masquerading as depth.

Examples Beyond Oxygen

The weakness of Kuhn’s claim becomes clearer when we look beyond his chosen example.

Take Mendel’s work on heredity. Mendel published in 1866, but his paper was ignored until 1900. Was heredity “discovered” in 1866, or in 1900, or in some later synthesis with chromosomes? Plainly, the recognition was gradual. But no one is surprised by that. It is only Kuhn who thinks the case paradoxical.

Or consider Maxwell’s equations. The full set emerged from years of revision, beginning with Maxwell’s 1861 paper and culminating in the 1873 Treatise on Electricity and Magnetism. Was electromagnetism “discovered” in 1861, 1873, or 1884, when Hertz confirmed radio waves? The answer is that the discovery unfolded over decades. Again: unsurprising.

Or the double helix. Watson and Crick’s 1953 paper was the product of Franklin’s X-ray data, Wilkins’s photographs, Pauling’s failed models, and countless discussions. The structure of DNA was not discovered in a single moment, but through a process of trial and correction. Who ever thought otherwise?

A Better Analogy: Invention and Craft

If one must analogise, discovery in science is less like finding a continent and more like crafting a sculpture. The raw material is there, but its form is hidden. The sculptor chips away, revises, steps back, reconsiders, and chips again. The final statue emerges only through a long labour.

No one would describe Michelangelo as “discovering” David on a Tuesday afternoon. He worked, he shaped, he refined. So too with Lavoisier, Darwin, Einstein. They sculpted their concepts until they stood recognisably true.

That is what discovery is. It is not revelation but craft. Kuhn’s error is to present this obvious truth as though it were a hidden secret.

Conclusion: The Third Sin

Kuhn’s third sin, then, is not merely to state the obvious but to elevate it into false profundity. He tells us, at length and with solemnity, that scientific discoveries are complex, extended, and resistant to simple dating. But this is something everyone already knew: scientists, historians, philosophers, laymen. It is as banal as noting that rivers meander or that children grow slowly.

What makes it a sin is not the observation itself, but the pretence that it is philosophy. By pretending that common sense is deep theory, Kuhn flatters himself and misleads his readers. He substitutes rhetoric for insight, pedantry for philosophy.

Thus his third sin. Where we expect illumination, we receive truism. Where we hope for depth, we find banality. Where we look for a philosophy of science, we find instead the empty tautology that discovery is not simple.

And from such trivialities Kuhn has built his reputation. That is the scandal.

Sin III: The Banality of Discovering that Discoveries Are Not Simple

Introduction

If Sin II revealed Kuhn’s penchant for trivialising the obvious—by pointing out that scientists are human—then his third sin compounds the pattern: Kuhn treats it as revelatory that scientific discoveries are not simple.

In The Structure of Scientific Revolutions (SSR), he devotes pages to demonstrating that discovery is a process, often long and contested, rather than a sudden epiphany. His extended case study of Joseph Priestley and Antoine Lavoisier in the late 18th century—the so-called “discovery” (or “invention”) of oxygen—exemplifies this theme. But the problem is not the history. It is Kuhn’s presentation of the history as though it undermines some widespread myth that discoveries are like finding lost car keys behind the sofa.

Nobody ever thought that Lavoisier stumbled across oxygen in that sense. To belabour the point, as Kuhn does, is to elevate a strawman and then ceremoniously knock it down.

Kuhn’s Text: His Own Over-Elaboration

Here are several passages in which Kuhn stresses the complexity of discovery:

● “Discovering a new sort of phenomenon is necessarily a complex event, one which involves recognizing both that something is and what it is.” (SSR, 2nd ed., p. 55)

● “A discovery is not the sort of thing that may be completed by a single man at a single moment.” (SSR, p. 56)

● “Though the change in paradigms and the change in scientific theory are not the same, both are accompanied by a transformation of the imagination.” (SSR, p. 111)

● “No wonder historians have had difficulty in dating precisely this extended process that their vocabulary impels them to view as an isolated event.” (SSR, p. 56)

To which the natural rejoinder is: yes, of course discovery is complicated. But who precisely did Kuhn imagine thought otherwise?

The Discovery vs. Invention Strawman

Kuhn compounds the confusion by worrying over whether oxygen was “discovered” or “invented.” He uses Priestley and Lavoisier to illustrate how scientific concepts require reconceptualisation before they “exist” in a meaningful way. Yet this is less revelation than semantics.

Your proposed afferent/efferent dichotomy is both more precise and more illuminating:

● Afferent (sensory) discovery: empirical observation of anomalies or phenomena.

● Efferent (motor) discovery: conceptual reframing and theoretical construction that gives those observations their meaning.

Priestley’s experiments with “dephlogisticated air” represented afferent discovery; Lavoisier’s theoretical reframing of combustion was efferent. But the integration of both is what constitutes science. Kuhn treats this integration as though it were paradoxical. In fact, it is simply the structure of cognition.

The Banality of Kuhn’s Point

If Columbus’s “discovery” of America involved decades of preparatory geography, nautical tradition, and maps, no one finds this perplexing. If Mozart’s Requieminvolved drafts, reworkings, and collaborative completion, no one imagines it sprang finished from his pen. Why should it be different with science?

Kuhn’s third sin, then, is to pretend that the non-simplicity of discovery requires a revolution in how we think about science, when in fact it requires only a modicum of common sense.

What Kuhn Misses: The Methodological Safeguards

The real achievement of science lies not in proving discovery is complex but in developing techniques to navigate that complexity:

● Operational definitions help pin down vague phenomena.

● Mathematical formalisation constrains theories to precision.

● Experimental reproducibility provides external verification across time and place.

None of these practices require Kuhn’s radical reframing of discovery as “conversion” or “revolution.” They merely reflect ordinary methodological maturity.

Secondary Scholarship

Many critics have highlighted this problem in Kuhn’s treatment of discovery.

● Larry Laudan: “Kuhn’s attempt to turn the truism that discovery is temporally extended into a deep epistemological problem is unconvincing” (Progress and Its Problems, 1977).

● Margaret Masterman catalogued the sheer semantic sprawl of Kuhn’s usage, noting that his categories often created more confusion than they resolved (“The Nature of a Paradigm,” in Criticism and the Growth of Knowledge, 1970).

● Steven Weinberg again: “Scientists know discoveries are hard. That is why we respect them. To belabour that fact is to miss the point” (Dreams of a Final Theory, 1992).

● Imre Lakatos objected that Kuhn’s “discovery as conversion” tropes reduced rational progress to biography rather than logic (Criticism and the Growth of Knowledge).

The consensus among serious philosophers and historians: Kuhn mistakes the semantic for the substantive.

An Alternative Example: The Human Genome Project

To illustrate, consider the mapping of the human genome. When did “the” discovery occur? At the first sequencing of fragments in the 1970s? At the announcement of the draft genome in 2000? At the completion of gaps in 2022?

Plainly, no single date captures it. But this does not constitute a profound epistemological dilemma. It is simply how complex projects unfold. To make it sound revelatory, as Kuhn does, is to miss the forest for the trees.

Conclusion

Kuhn’s third sin lies in his elaboration of a banality. Yes, discovery is complex. Yes, it requires both afferent observation and efferent reconceptualisation. But this is no startling revelation; it is the obvious structure of all creative human endeavour.

Kuhn dresses this truth in paradox and semantics, only to make science appear more mysterious than it is. In the process, he both trivialises the achievement of discovery and misleads generations of readers into believing he has struck gold where, in fact, he has struck gravel.

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Chapter 26 - The Third Sin - Discoveries Aren't Simple