Ch 11: Arguments from Reasoning — Logos

ENGL 1301 · Chapter 11 — Logos

The big idea Logos is the appeal to an audience's sense of reasoning — not just facts and statistics, and not formal logic. The chapter gives eight ways reasoning gets built into an argument, and several of them work invisibly through shared assumptions.

By the end you can

  • Define logos as an appeal to an audience's sense of reasoning, and correct the two common misreadings of it.
  • Define ideology, commonplaces, mythos, and enthymeme.
  • Recognize logos working through structure, comparison, definition, ideology, commonplaces, mythos, enthymemes, and word choice.
  • Think critically about how others appeal to logos and how you can in your own writing.

How to read a long, term-heavy chapter

Chapter 11 is the longest reading and packs in eight tools plus four terms to define. The trap is finishing it with a fuzzy sense of 'reasoning' and no firm hold on the vocabulary.

Not sure about the basics underneath this lesson?

What today is

Planner note 598 is the whole Top Hat chapter — about 7,048 words, the longest single reading day. Read it there; this page guides the reading and gives you the checkpoint.

What today is (2)

It's dense with named terms. Read for the eight tools and, especially, the four vocabulary words the chapter promises you'll define: logos, ideology, commonplaces, mythos, enthymeme.

What logos really is — and isn't

Logos is an appeal to the audience's sense of reasoning about an issue — often the commonsense reasoning shared by a community.

What logos really is — and isn't (2)

The chapter corrects two common misreadings: logos is not just facts and statistics (what persuades is how they're reasoned with), and logos is not formal logic (which tests validity). The flat-earth example is there to show that evidence only persuades when it fits the audience's way of reasoning.

Structure as reasoning

How an argument is arranged is itself an appeal to reasoning (11.1). Three common structures: narrative (we follow a familiar story), cause and effect / consequences, and problem to solution.

Structure as reasoning (2)

The two competing Texas Monthly articles about the 2021 blackout are the worked example for causal reasoning; the CDC whooping-cough infographic is the problem-to-solution example. Notice that a causal argument only works if the audience shares its underlying logic about who or what is to blame.

Comparison, metaphor, and definition

Analogies and metaphors (11.2) reason by comparison — an analogy explains the unfamiliar with the familiar; a metaphor treats two things as the same and shapes how we think (Lakoff and Johnson's "argument is war").

Comparison, metaphor, and definition (2)

Definition, distinction, and categorization (11.3) reason by framing terms — Jay Rosen splitting "political" from "politicized," or Shirky sorting media into broadcast, one-to-one, and many-to-many. Defining a term is an argumentative move, not a neutral one.

The invisible layer: ideology, commonplaces, mythos

Ideology (11.4) is a worldview — assumptions we think with, not about. The chapter warns against flattening it to "liberal vs. conservative."

The invisible layer: ideology, commonplaces, mythos (2)

Commonplaces (11.5) are elastic, undefined terms — freedom, family values, cancel culture — that let audiences fill in the blanks from shared ideology. Mythos (11.6) is a grand cultural narrative, like the American Dream, that carries commonsense weight even when it doesn't match reality.

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Enthymemes and word choice

An enthymeme (11.7) is a "silent argument" that leans on an unstated premise or conclusion — "Socrates will die" assumes Socrates is a man and all men die. Enthymemes are powerful because audiences fill the gap automatically, and they often ride on unspoken ideology.

Enthymemes and word choice (2)

Word choice (11.8) frames reasoning: illegal vs. undocumented immigrant, pro-life vs. pro-choice, fetus vs. baby. What you call a thing tells the audience how to reason about it — and usually stirs emotion (pathos) too.

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When you've finished the chapter

Take the Chapter 11 checkpoint: three short questions and one essay, three tries each. The shorts check the definitions and one tool in action; the essay asks you to state the chapter's claim and show how its tools build it.

When you've finished the chapter (2)

Nothing here goes to the course. If a definition won't come, reread that short section — the terms are precise and worth getting exactly right.

Final checklist

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