FROM THE EDITORS 

This issue nicely illustrates the varied range of interests of our readers and contributors. 
Jonathan Adler argues for the importance of teaching the distinction between internal 

and external negation over expressions for belief. Do you believe this distinction is not 
important? Or do you not believe this distinction is important? Wrong on both counts, 
Adler contends. The distinction is a nice application of logic to epistemology at a very 
practical level. 

The conventional wisdom has it that Monroe Beardsley originated tree diagramming. 
Jean Goodwin shows that the conventional wisdom is mistaken. The noted early-20th 
century legal scholar J.H. Wigmore was diagramming legal arguments when Beardsley was 
in short pants. Goodwin introduces us to Wigmore's diagramming method and some of its 
virtues, not least of which is the place given to the rhetorical dimension of arguments. 

Our policy has been that fallacies should not be multiplied beyond necessity, but 
Herman Stark argues that in the current climate of relativism, it is necessary for teachers 
to draw attention to the vacuousness of nearly a score of our students' -and our cul-
ture's-nuggets of conventional "wisdom." 

As part of his ongoing development of a full-fledged, systematic pragmatic theory of 
argumentation, Douglas Walton offers ten dialectical rules for dealing with problems of 
ambiguity in argumentative discourse, inspired by Grice's rules for collaborative conver-
sation. 

Where does "two-wrongs-make-a-right" reasoning originate? S.K. Wertz proposes 
an hypothesis about the answers to this questions. He traces it back to utilitarianism. 

The two Book Reviews in this issue examine monographs on rationality. Trudy Govier has 
been in dialogue with Ralph Johnson over his concept of the dialectical tier, and we are 
pleased to publish her critical review of Johnson's latest and fullest statement of his 
theory of argument. David Hitchcock provides a shorter but extensive review of 
Stovanovich's study of individual differences in reasoning. 

We hope that the Examples Supplement is useful to instructors. Keep sending in your 
material to Claude Gratton. See his note about the kind of material he wants, and how to 
reach him. 

FROM THE BOOK REVIEW EDITOR Jonathan Adler 

We want to renew our call for authors to submit their books to us for review. Right now our 
backlog is low so book reviews will come out quickly, if reviewers submit them in a timely 
fashion. 

This is a big "if'. Some of you may be reasonably upset that your book has not been 
reviewed in Informal Logic, when it was both submitted early and clearly within our pur-
view. In general, it is not because the books received for review have not been sent out to 
reviewers. It is either that I did not find a reviewer after a couple of tries or those who 
agreed to review them failed to do so. So I also want to renew my invitation to those of you 
who are interested in reviewing to please let us know.