Hossein Jorjani
First publication: 2026 – 06 – 30
Bacon’s principal target of criticism in Novum Organum I:30 was the upward movement from particulars to general propositions. He argued that the traditional method, which he termed inductio vulgaris (“vulgar induction”), merely gathered instances, leapt prematurely to universal statements, and then relied on syllogistic demonstration to stabilize these ill-founded generalities. Against this, Bacon proposed inductio vera (“true induction”), a systematically mediated ascent proceeding through axiomata media, controlled exclusions, and the orderly tabulation of instances. His methodological reform was therefore directed not at the downward derivation of consequences—whose validity depended chiefly upon the soundness of the axioms—but at the generation of those axioms themselves, which he regarded as the decisive weakness of the received logic.
Correspondingly, Bacon treated the downward movement from established axioms to new experiments and practical works as comparatively unproblematic. Once axioms had been securely established through inductio vera, their application to particulars yielded predictions, operative rules, and further lines of inquiry. Although this descending movement resembles what is now called deductive inference, Bacon did not conceive of it as a distinct methodological category requiring reform. Seventeenth-century usage did not yet treat deductio as the general category of necessary inference that it later became; demonstrative reasoning was identified primarily with the syllogism, while deductio functioned more broadly as “leading out” or deriving consequences. Consequently, Bacon saw no need to oppose a “true deduction” to a “syllogistic deduction.” The weakness of scholastic reasoning lay not in deduction itself, but in the inadequately grounded premises from which deductions proceeded. Within Bacon’s methodological architecture, only the ascent required renovation, for only a reformed induction could provide the axioms capable of supporting reliable descending inferences.
Hossein Jorjani 