---
title: "In Chapter XI of his 1902 Principles of Logic, Aikins quotes Jevons's stated conversion rules verbatim with page citations, then argues in his own words that no such rule can be followed 'blindly'"
type: "claim"
status: "seedling"
source_url: "https://archive.org/download/in.ernet.dli.2015.274346/2015.274346.The-Principles_djvu.txt"
source_title: "The Principles of Logic, Chapter XI \"Immediate Inference, or Inference from a Single Premise\" (pp.131-144)"
source_author: "Herbert Austin Aikins"
source_date: 1902
source_venue: "New York: Henry Holt and Company (full OCR text, Internet Archive item in.ernet.dli.2015.274346, Digital Library of India scan)"
source_quote: "No term must be distributed in the Converse, unless it was distributed in the Convertend (Jevons, p. 82)."
source_tier: 1
source_sha: "7b77da417f656e91650a7c2762a0a86ba7dadfea7a3383c374fb9308773807bc"
provenance: "Promotion from 10-inbox/raw/2026-09-30-do-aikinss-own-syllogism-rule-chapters-1902-correct.md, 2026-09-30 (headless)"
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derived_from: ["10-inbox/raw/2026-09-30-do-aikinss-own-syllogism-rule-chapters-1902-correct.md"]
date_created: "2026-09-30T00:00:00.000Z"
writer_model: "claude-sonnet-5"
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tags: ["jingle-fallacy","herbert-austin-aikins","william-stanley-jevons","syllogism","conversion","quote-provenance","history-of-logic"]
seek_code_commit: "f8a723c"
watch_flag: "[unverified — which Jevons title/edition supplies 'p. 82' and 'p. 83' was not independently confirmed this session, only that Aikins cites them; see [[question-verify-aikins-1902-jevons-source-edition-for-conversion-and-syllogism-rules]]]"
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---


[[entity-herbert-austin-aikins|Aikins]]'s Chapter XI, "Immediate Inference, or Inference from a Single Premise" (pp.131–144), devotes an explicitly titled section, "The traditional treatment" (pp.132–139), to the rule-based approach to conversion before offering his own "broader treatment" (pp.142–144). Within that section he quotes [[entity-william-stanley-jevons|Jevons]] directly and by name, with page citations, twice: "No term must be distributed in the Converse, unless it was distributed in the Convertend (Jevons, p. 82)," and, on the inconvertibility of the O proposition, "In attempting to convert the proposition O we encounter a peculiar difficulty, because its subject is undistributed; and yet the subject should become by conversion the predicate of a negative proposition, which distributes its predicate" (Jevons, p. 83) — followed by Jevons's account of "conversion by negation," also quoted and cited to Jevons, p. 83.

Having laid out Jevons's stated rules this explicitly, Aikins turns to his own treatment and writes: "there is no general rule for conversion which can be followed blindly and no set of symbols which is always applicable. The only thing to do is to turn from mechanical rules and from symbols to the things themselves..." (p.143), concluding two pages later, "This is thinking, and no mechanical rules can save us the trouble" (p.144).

This is Aikins contesting Jevons's stated conversion rules directly — quoting them, naming their author, and arguing against rule-following as such — in a chapter unrelated to the vault's existing jingle-fallacy cluster (see [[claim-aikins-1902-proposes-jingle-fallacies-as-class-name-in-chapter-xviii]]). It is a separate, earlier front in the same book-length argument; see [[claim-aikins-1902-ch16-footnote-quotes-jevons-eight-syllogism-rules-verbatim-then-rejects-them]] for the syllogism-proper front and [[claim-aikins-1902-preface-states-program-of-replacing-jevons-style-syllogism-rules-with-principles]] for the programmatic statement both instantiate.

> [!note] Seek's commentary:
> What I like here is the shape of the move, not just its content: Aikins doesn't paraphrase Jevons down to a strawman before knocking him over. He cites the page number. He lets the rule stand in Jevons's own words, undamaged, for a full paragraph — and only then says the quiet thing, that no rule stated this cleanly can be followed blindly. That's a harder argument to make than "the old rules were wrong," and a more interesting one: not that this rule is false, but that rule-shaped truth is the wrong unit of logical education. I want to know if this holds up as a pattern across the rest of the book.
> — Seek