Novum Organum by Francis Bacon

Context

The Novum Organum — the "new instrument" or "new organon" — was published in 1620 as the second part of Francis Bacon's projected Great Instauration, his grand plan to rebuild human knowledge. The title deliberately confronts Aristotle's Organon, the old instrument of logic: Bacon judged the syllogism and the deductive ideal of the Posterior Analytics useless for discovering new knowledge of nature. He wrote in an age of ferment — Galileo was turning telescopes on the heavens, and the voyages of discovery were expanding the known world — yet the universities still taught from ancient texts. Bacon's diagnosis was that the human mind, left to itself, is a distorting mirror, and that knowledge would advance only by a new method: a disciplined, stepwise induction from carefully gathered observations to increasingly general axioms. The book is therefore both a critique of the intellectual habits of his time and a proposal for the systematic method that would become the scientific method.

Core Arguments

The Novum Organum advances three connected arguments. First, the idols: the mind is beset by systematic sources of error that must be identified and purged. Bacon names four. The idols of the tribe are distortions built into human nature — the tendency to see order where there is none, to prefer agreeable conclusions, to generalize from too little. The idols of the cave are the distortions of the individual — personal temperament, education, and habit. The idols of the marketplace arise from language: words are poorly defined and mislead us, a prescient warning about the effects of imprecise terms. The idols of the theatre are the false systems of philosophy itself — dogmatic schools and superstition presented as knowledge. Second, the critique of the old method: the syllogism and simple enumeration induction (generalizing from a few cases) are insufficient; they leap from particulars to the highest generalizations and cannot discover the intermediate axioms where nature's regularities live. Third, the new induction: knowledge must ascend gradually through three tables — the table of presence (instances where the nature occurs), the table of absence (closely similar cases where it does not), and the table of degrees (cases where it varies in intensity) — from which the investigator, by exclusion and elimination, derives the form or cause. Bacon's famous example is the investigation of heat, which he works through in detail.

Key Concepts

• The idols: the four classes of systematic error — tribe, cave, marketplace, and theatre — that corrupt inquiry before it begins.
• Form: the essence or cause to be discovered — what heat, whiteness, or gravity fundamentally is, expressed as the law of the nature.
• The tables: the method of presence, absence, and degrees, organizing instances so that induction can eliminate hypotheses.
• Instantia crucis (crucial instance): the decisive experiment that discriminates between competing explanations, ancestor of the controlled test.
• Aphorism: Bacon's preferred style — short, dense, memorable statements, deliberately opposed to the elaborate systems of the schools.
• Fruit and light: Bacon's two kinds of experiment — the useful (fruit) and the truth-disclosing (light), with priority given to the latter.

Legacy & Influence

The Novum Organum is the charter document of experimental science. Its insistence that knowledge begins in observation, advances by controlled comparison, and is corrected by experiment shaped the Royal Society — whose founders looked to Bacon as their prophet — and the entire tradition of empiricism. The doctrine of the idols anticipates modern psychology's catalog of cognitive biases: Bacon's tribe idol is the ancestor of confirmation bias and the tendency to perceive pattern in noise. The three tables are the ancestor of John Stuart Mill's methods of agreement, difference, and concomitant variation, which remain the logic of experimental design. Yet Bacon's own induction proved too mechanical for actual science — scientists discovered that hypothesis, mathematics, and imaginative leaps are indispensable — a correction supplied by Peirce (abduction), Popper (conjecture and refutation), and the working practice of the sciences themselves. The book's greatness lies less in its finished method than in its founding demand: that knowledge be built from nature, not from books, and that the mind's errors be systematically confessed and corrected.

Reading Guide

The Novum Organum consists of two books of aphorisms. Book I (Aphorisms 1-130) is the accessible masterpiece: the diagnosis of the idols and the critique of the old logic, written in Bacon's compact, epigrammatic Latin. Book II (Aphorisms 1-52) works through the method of the tables in detail, culminating in the analysis of heat — heavier going, but rewarding for those who want the machinery. The standard modern English translation is the one in The New Organon (Cambridge Texts in the History of Philosophy), edited by Lisa Jardine and Michael Silverthorne. For a first reading, Aphorisms 1-68 of Book I give the full sweep of the argument; the "idols" passages (Aphorisms 38-68) are the most famous and the most quotable.

Related Works

• Organon by Aristotle — the old instrument Bacon set out to replace
• Discourse on Method by Descartes — the rationalist counterpart, published seventeen years later, proposing systematic doubt as the route to certainty
• Enquiry Concerning Human Understanding by Hume — the empiricist tradition's radical development of Bacon's starting point
• The Logic of Scientific Discovery by Popper — the modern account of how hypotheses are generated and tested, correcting Bacon's induction
• See what is empirical evidence and what is the scientific method for how Bacon's program came to be practiced