CHAPTER Y.

ON DEDUCTION.

(64) Deduction.—(G5) Perfect Deduction.—(66, 67) ImperfectDeduction.

(64.) As by the process of induction we areenabled to classify a large number of facts underone general rule; so by deduction we are enabledto apply this induced knowledge to any particularinstance. As an example of a deduction, we maytake, as an illustration, the deduction: “ Man ismortal,” or in electro-biological language, man Aalways suffers death Z. From this induction werightly deduce that John A + B is liable to death,because John, contains A the properties of a manin his organization, or we may express the fact bysymbols, that A + B is conjoined with Z.

(65.) Deductions are of two kinds, perfect andimperfect. In all cases of perfect deductions, theinference derived from the law is certain; thus, ifI have twenty pounds, and add thereto twentypounds, I may of certainty deduce that I shall then