(2) _Deduction._ This is a logical process exactly the reverse of the first, in that it descends from a generalized statement reached by the inductive process to some particular, or subordinate class of particulars, ostensibly covered by the general maxim. Induction examines a number of particulars, and then makes a leap, it may be a long leap, over all intervening particulars, to its Generalization clamping them. The main use of Deduction is to make sure of any one of these overleaped particulars, which may come into importance, and thus confirm the generalization, or correct it. It is not strictly true, what is often alleged against deductive reasoning, that there is nothing _new_ in its result, that the Induction had already passed through that particular in rising to its Generalization, and therefore to descend to any particular link to examine that, is something useless. The exact truth is, that it _is_ useless to examine again deductively the very particulars that were carefully studied inductively, but on the other hand there is always much actually untraversed territory between these already examined particulars and the inductive generalization, and Deduction is often very useful in carrying us down to questionable points in this territory. Even Lord Bacon, who scorned the syllogism, admits this: "_Axioms duly and orderly formed from particulars easily discover the way to new particulars, and thus render sciences active._" We will illustrate this by a reference to Franklin's famous induction to prove the identity of lightning with electricity. Only one experiment, and that a very rude one, was needful in this case; although usually many experiments, or the careful observation of many particulars, are necessary in inductions; but the generalization having been gained, Deduction had a chance to try its hand; it had long been observed that electricity could be conducted from point to point, and if electricity and lightning be identical, then lightning can be so conducted; therefore, deduced Franklin, a pointed iron rod elevated above buildings will harmlessly conduct lightning from the clouds into the ground. Deduction gave mankind the lightning-rod, and so made one point of science "_active_," as Bacon phrased it; and it is noticeable, that Turgot's felicitous epigram turns on the deductive rather than the inductive side of Franklin's experiment: _Eripuit coelo fulmen sceptrumque tyrannis._