Novum OrganumFrancis Bacon

Bacon's Novum Organum announces a new method of investigation to replace the Aristotelian logic that had governed inquiry for two thousand years. The title is deliberate: a new organon (instrument) to supersede Aristotle's old one. Where the syllogism moves from general premises to particular conclusions, Bacon's method moves from particular observations to general laws through disciplined induction.

Book I diagnoses why natural philosophy has stagnated. The human mind is not a clear mirror but a distorting one, and Bacon catalogs the distortions as four classes of "idols." Idols of the Tribe are errors common to human nature (the tendency to see more order than exists). Idols of the Cave are individual biases (each person's private education and temperament). Idols of the Marketplace arise from the imprecision of language. Idols of the Theatre are received philosophical systems that impose false frameworks on nature. These must be identified and set aside before genuine inquiry can begin.

Book II outlines the method itself. The investigator compiles tables of presence, absence, and degrees for the phenomenon under study (Bacon uses heat as his example), then performs an exclusion to eliminate candidate explanations until the true "form" remains. The method is painstaking and anti-speculative. Bacon insists on experiment over contemplation, on gradual ascent over premature generalization.

The Novum Organum was left unfinished, and Bacon never completed the larger project it was meant to serve. But its diagnosis of intellectual error and its insistence that knowledge begins with observation shaped the self-understanding of modern science from the Royal Society onward.