Five-minute digest

Novum Organum

Francis Bacon

Summary

The Novum Organum ('new instrument') is the second and only substantially completed part of Bacon's projected Instauratio Magna, a six-part plan to rebuild human knowledge from its foundations. Its title throws down a challenge to the Organon, the collection of Aristotle's logical works that had governed university teaching for centuries. Bacon argues that the syllogism forces assent but cannot discover anything new, because it works on words, and words stand for notions abstracted carelessly from things. The sciences of his day, he says, are elaborations of a few familiar observations rather than methods of discovery, and the practical inventions that do exist came by chance and craft rather than philosophy. The book is written as numbered aphorisms rather than continuous argument, a form Bacon chose deliberately because broken, provisional statements invite further inquiry instead of closing it off. Book I, of 130 aphorisms, is the destructive part. Its most famous section is the doctrine of the idols, the false images that beset the mind before any evidence arrives. The idols of the tribe are errors common to human nature, such as seeing more order than exists and noticing hits while ignoring misses. The idols of the den (the cave) come from each person's temperament, education and reading. The idols of the market arise from language, which fixes vague or empty names. The idols of the theatre come from philosophical systems, which Bacon treats as so many stage plays. He then surveys why knowledge has stalled: reverence for antiquity, the contentious habits of the schools, the confusion of natural philosophy with theology, impatience for quick results, and the boasting of alchemists and magicians that discredits sober inquiry. He ends Book I on grounds for hope, insisting that the printing press, gunpowder and the compass have changed the world more than any empire, and that a patient, cooperative method could yield far more. Book II, of 52 aphorisms, is the constructive part. Taking heat as its worked example, Bacon assembles a table of instances where heat is present, a table of closely similar cases where it is absent, and a table of degrees where it varies. He then excludes every candidate nature that fails to track heat across the tables, and ventures a provisional 'first vintage': heat is an expansive motion, restrained, acting in the smaller particles. The rest of the book catalogues twenty-seven kinds of 'prerogative instances', favored observations that speed inquiry, among them solitary, migrating, glaring and crucial instances, the last a forerunner of the decisive experiment. The book stops before the further 'helps' it promises. What survives is less a usable algorithm than a manifesto for organised, experimental, collaborative natural history, later claimed by the founders of the Royal Society.

Top Lessons

Name your idols before you trust your data
Bacon's four idols anticipate what psychologists now call cognitive biases: confirmation, availability, motivated reasoning, the seduction of terminology, loyalty to a school. He thought no method could work until these predispositions were identified, because they shape what counts as an observation in the first place.
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The negative instance carries more weight
In Book I, Aphorism XLVI and in the exclusion tables of Book II, Bacon insists that one solid counter-instance outweighs many agreeing cases. Progress comes from systematically ruling things out, not from piling up confirmations.
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Ants, spiders and the bee
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Verified Quotes

“Man, as the minister and interpreter of nature, does and understands as much as his observations on the order of nature, either with regard to things or the mind, permit him, and neither knows nor is capable of more”

"Man, as the minister and interpreter of nature, does and understands as much as his observations on the order of nature, either with regard to things or the mind, permit him, and neither knows nor is capable of more" — Francis Bacon, Novum Organum, Book I, Aphorism I, trans. Joseph Devey (ed.), 1902.

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“Knowledge and human power are synonymous, since the ignorance of the cause frustrates the effect; for nature is only subdued by submission”

"Knowledge and human power are synonymous, since the ignorance of the cause frustrates the effect; for nature is only subdued by submission" — Francis Bacon, Novum Organum, Book I, Aphorism III, trans. Joseph Devey (ed.), 1902.

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“the specious meditations, speculations, and theories of mankind are but a kind of insanity, only there is no one to stand by and observe it”

"the specious meditations, speculations, and theories of mankind are but a kind of insanity, only there is no one to stand by and observe it" — Francis Bacon, Novum Organum, Book I, Aphorism X, trans. Joseph Devey (ed.), 1902.

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An Essay Concerning Human Understanding, Book II, Ch. XXXIII, §14
A friend of mine knew one perfectly cured of madness by a very harsh and offensive operation The patient was grateful but could never bear the sight of the operator, because the image recalled his agony.
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When the imagination, from any extraordinary ferment of the blood and spirits, acquires such a vivacity as disorders all its powers and faculties, there is no means of distinguishing betwixt truth and falshood Hume explains madness as an excess of the same vivacity that ordinarily constitutes belief, so that fiction and memory become indistinguishable.
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The Narrative of Arthur Gordon Pym of Nantucket, Ch. 2-3
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A Treatise of Human Nature, That Even After The Observation Of The Frequent Or Constant Conjunction
us any remedy For this reason I rely entirely upon them and take it for granted whatever may be the reader's opinion at this present moment that an hour hence he will be persuaded there is both an external and internal world and going upon that supposition I intend to examine some general systems both ancient and modern which have been proposed of both before I proceed to a more particular enquiry concerning our impressions This will not perhaps in the end be found foreign to our present purpose SECT III OF THE...

“But where are the portraits of those who have perished in spite of their vows”

"But where are the portraits of those who have perished in spite of their vows" — Francis Bacon, Novum Organum, Book I, Aphorism XLVI, trans. Joseph Devey (ed.), 1902.

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“The human understanding resembles not a dry light, but admits a tincture of the will”

"The human understanding resembles not a dry light, but admits a tincture of the will" — Francis Bacon, Novum Organum, Book I, Aphorism XLIX, trans. Joseph Devey (ed.), 1902.

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“The former like ants only heap up and use their store, the latter like spiders spin out their own webs”

"The former like ants only heap up and use their store, the latter like spiders spin out their own webs" — Francis Bacon, Novum Organum, Book I, Aphorism XCV, trans. Joseph Devey (ed.), 1902.

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“We must not then add wings, but rather lead and ballast to the understanding, to prevent its jumping or flying”

"We must not then add wings, but rather lead and ballast to the understanding, to prevent its jumping or flying" — Francis Bacon, Novum Organum, Book I, Aphorism CIV, trans. Joseph Devey (ed.), 1902.

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“printing, gunpowder, and the compass. For these three have changed the appearance and state of the whole world”

"printing, gunpowder, and the compass. For these three have changed the appearance and state of the whole world" — Francis Bacon, Novum Organum, Book I, Aphorism CXXIX, trans. Joseph Devey (ed.), 1902.

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say on the King of Navarre against whom all this is being directed M de Lansac is at Bourg and has two war vessels which remain in attendance on him His functions are naval I tell you what I learn and mix up together the more or less probable hearsay of the town with actual matter of fact that you may be in possession of everything I beg you most humbly to return directly affairs may allow you to do so and assure you that meanwhile we shall not spare our labour or if that were necessary our life to maintain the...
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torture me I might let slip a word of where the ship is for I got the ship part by luck and part by risking and she lies in North Inlet on the southern beach and just below high water At half tide she must be high and dry The ship exclaimed the doctor Rapidly I described to him my adventures and he heard me out in silence There is a kind of fate in this he observed when I had done Every step it s you that saves our lives and do you suppose by any chance that we are going to let you lose yours That would be a poo...

“Now the empire of man over things is founded on the arts and sciences alone, for nature is only to be commanded by obeying her”

"Now the empire of man over things is founded on the arts and sciences alone, for nature is only to be commanded by obeying her" — Francis Bacon, Novum Organum, Book I, Aphorism CXXIX, trans. Joseph Devey (ed.), 1902.

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“Since, however, truth emerges more readily from error than confusion, we consider it useful to leave the understanding at liberty”

"Since, however, truth emerges more readily from error than confusion, we consider it useful to leave the understanding at liberty" — Francis Bacon, Novum Organum, Book II, Aphorism XX, trans. Joseph Devey (ed.), 1902.

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Medical Lens

The Novum Organum is not a medical treatise. Its importance for medicine lies in method and bias. The doctrine of the idols is a pre-modern taxonomy of cognitive error that maps readily onto diagnostic and research bias: confirmation and neglect of negative cases (I.XLVI), affect-driven belief (I.XLIX), the authority of terminology (I.LIX–LX) and school loyalty (I.LXI–LXII). Bacon praises physicians for attending to observable qualities but blames them for reducing these to elementary qualities and occult powers. That is a critique of Galenic and Paracelsian reasoning, not a rejection of practice. Book II's examples include a short pharmacology of soporifics and opiates framed in terms of the vital 'spirits' of the brain's ventricles. The text concedes the drugs' danger and also their usefulness in moderation. Bacon's list of quack promises (I.LXXXVII), among them prolonged life, relief of pain and exaltation of the intellect, reads today like a catalogue of enhancement claims. His wider programme, including the coinage of 'euthanasia' for a gentle medical death in the Advancement of Learning, belongs in the history of medical ethics.

Psychology Unconscious Ancient Medicine Humoral Medicine Physicians Doctors Quackery Charlatans Opium Laudanum Pharmacology Poisons Sleep Insomnia Aging Senescence Medical Ethics

Book I, Aphorisms XLI–XLIX
Idols of the tribe and den: the distorting mirror of human perception, the pull of first conclusions, neglect of negative instances, and belief tinctured by will and passion.
Book I, Aphorism LXVI
Bacon criticises the doctrines of elementary qualities and occult specific powers while commending physicians' attention to attraction, astringency, maturation and other secondary qualities of medicines.
Book I, Aphorism LXXIII
Citing Celsus, Bacon observes that medical experiments came first and philosophical causes were assigned afterward, using medicine as evidence against speculative systems.
Book I, Aphorism LXXXVII
Impostors who promise prolongation of life, retarding of old age, relief of pain and the exaltation of the intellect discredit honest natural philosophy.
Book II, Aphorism L
Medicines that condense the flesh or the spirits: mild soporifics (violet, dried roses, lettuce), rose-water for fainting fits, and opiates that expel the spirits from the brain's ventricles yet in moderation may aid cure and longevity.

Novum Organum

Summary

Top Lessons

Name your idols before you trust your data

The negative instance carries more weight

Ants, spiders and the bee

Knowledge as power, and the question of its uses

Verified Quotes

Medical Lens