(5) From the viewpoint of your definition criticise this: “A sorites is a series of prosyllogisms and episyllogisms in which all of the conclusions are suppressed except the last.”

(6) Prove the truth of the two rules of the regressive sorites.

(7) Show that the prosyllogism and the episyllogism may be progressive or regressive.

(8) “Reasoning from cause to effect”—is such progressive or regressive? Explain.

(9) Which is inductive in nature, the progressive form of reasoning or the regressive? Explain.

(10) Test the validity of the enthymemes on pages [248] and [249].

(11) “A sorites is at least as immediately convincing as the chain of syllogisms into which it can be decomposed.” Discuss this.


CHAPTER 14.
CATEGORICAL ARGUMENTS TESTED ACCORDING TO FORM.

1. ARGUMENTS OF FORM AND MATTER.