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All teaching, and all intellectual learning, proceeds on the

basis of previous knowledge, as will appear on an examination of

all. The Mathematical Sciences, and every other system, draw

their conclusions in this method. So too of reasonings, whether

by syllogism, or induction: for both teach through what is

previously known, the former assuming the premisses as from wise

men, the latter proving universals from the evidentness of the

particulars. In like manner too rhetoricians persuade, either

through examples (which amounts to induction), or through

enthymemes (which amounts to syllogism).

CHAP. II