Monthly Archives: August 2015

Genus & Species Bonus

Lessons about genus and species charts often emphasize the capability of these charts to show relationships between terms (i.e. this is a kind of that). This is one benefit, but we should also note the benefit they provide in helping to develop arguments. Two classic examples should help to demonstrate this.

In C. S. Lewis’s The Lion, The Witch, and The Wardrobe, Susan and Peter are concerned with Lucy, who insists that she has gotten into the land of Narnia through a magic wardrobe. The Professor proceeds to develop an argument based off of this genus and species chart: Continue reading Genus & Species Bonus

Ad Populum Mitosis?

While studying informal fallacies to prepare the next lesson in my upcoming rhetoric text Fitting Words, I observed something surprising about the ad populum fallacy. I have generally understood this fallacy to be simply an appeal to the masses, indeed to the mere mass of the masses” (Introductory Logic, Nance and Wilson) as in “Mom, all my friends are doing it!” (for which all mothers have learned the counterexample “If all your friends were jumping off of a cliff, should you?”)

But in all the standard college logic texts that I own (not a small sample), argumentum ad populum is taken to mean, quite broadly, an improper appeal to emotion. As a sample: Continue reading Ad Populum Mitosis?

What will I learn in Logic?

Logic-Bundle[1]The purpose of logic is to help students to be “masters of words in their intellects,” as Dorothy Sayers wrote, rather than “prey to words in their emotions.”

To this end, Introductory Logic teaches and trains students in four key skills: defining terms, making accurate statements, constructing arguments, and detecting fallacies in argument, the central concept being validity.

Adorable Fallacies

In The Amazing Dr. Ransom’s Bestiary of Adorable Fallacies, Doug Wilson and son N.D. have given us a comprehensive book that makes learning about informal fallacies a hoot! To the familiar fallacies of ad hominem, circular reasoning, equivocation and their ilk, they have added a section on millennial fallacies with which we sorely need to be familiar: cool-shame, milquetoastery, ad imperium, pomo relativism, sensitivity shamming, and more!

In our day of muddled thinking, this guide to fifty popular ways to reason poorly is must read for anyone who recognizes the need for a field guide to thinking clearly!

Another helpful book for our times from Canon Press.