Blackwoods Edinburgh Magazine | Page 3

If any one should so far depart from common sense as to question the mortality of some great king, we should think it sufficient to say for all argument--the king is a man!--virtually implying the whole triplet above mentioned:--
"All men are mortal. The king is a man; Therefore the king is mortal."
"In pursuing the supposed investigation, (into the operation of reasoning,)" says Archbishop Whately, "it will be found that every conclusion is deduced, in reality, from two other propositions, (thence called Premisses;) for though one of these may be and commonly is suppressed, it must nevertheless be understood as admitted, as may easily be made evident by supposing the denial of the suppressed premiss, which will at once invalidate the argument; e.g. if any one, from perceiving that 'the world exhibits marks of design,' infers that 'it must have had an intelligent author,' though he may not be aware in his own mind of the existence of any other premiss, he will readily understand, if it be denied that 'whatever exhibits marks of design must have had an intelligent author,' that the affirmative of that proposition is necessary to the solidity of the argument. An argument thus stated regularly and at full length, is called a syllogism; which, therefore, is evidently not a peculiar kind of argument, but only a peculiar form of expression, in which every argument may be stated."--Whately's Logic, p. 27.
"It will be found," he continues, "that all valid arguments whatever may be easily reduced to such a form as that of the foregoing syllogisms; and that consequently the principle on which they are constructed is the UNIVERSAL PRINCIPLE of reasoning. So elliptical, indeed, is the ordinary mode of expression, even of those who are considered as prolix writers,--i.e. so much is implied and left to be understood in the course of argument, in comparison of what is actually stated, (most men being impatient, even to excess, of any appearance of unnecessary and tedious formality of statement,) that a single sentence will often be found, though perhaps considered as a single argument, to contain, compressed into a short compass, a chain of several distinct arguments. But if each of these be fully developed, and the whole of what the author intended to imply be stated expressly, it will be found that all the steps, even of the longest and most complex train of reasoning, may be reduced into the above form."--P. 32.
That it is not the office of the syllogism to discover new truths, our logician fully admits, and takes some pains to establish. This is the office of "other operations of mind," not unaccompanied, however, with acts of reasoning. Reasoning, argument, inference, (words which he uses as synonymous,) have not for their object our advancement in knowledge, or the acquisition of new truths.
"Much has been said," says Archbishop Whately, in another portion of his work, "by some writers, of the superiority of the inductive to the syllogistic methods of seeking truth, as if the two stood opposed to each other; and of the advantage of substituting the Organon of Bacon for that of Aristotle, &c. &c., which indicates a total misconception of the nature of both. There is, however, the more excuse for the confusion of thought which prevails on this subject, because eminent logical writers have treated, or at least have appeared to treat, of induction as a kind of argument distinct from the syllogism; which, if it were, it certainly might be contrasted with the syllogism: or rather the whole syllogistic theory would fall to the ground, since one of the very first principles it establishes, is that all reasoning, on whatever subject, is one and the same process, which may be clearly exhibited in the form of syllogisms.
"This inaccuracy seems chiefly to have arisen from a vagueness in the use of the word induction; which is sometimes employed to designate the process of investigation and of collecting facts, sometimes the deducing an inference from those facts. The former of these processes (viz. that of observation and experiment) is undoubtedly distinct from that which takes place in the syllogism; but then it is not a process of argumentation: the latter again is an argumentative process; but then it is, like all other arguments, capable of being syllogistically expressed."--P. 263.
"To prove, then, this point demonstratively, (namely, that it is not by a process of reasoning that new truths are brought to light,) becomes on these data perfectly easy; for since all reasoning (in the sense above defined) may be resolved into syllogisms; and since even the objectors to logic make it a subject of complaint, that in a syllogism the premises do virtually assert the conclusion, it follows at once that no new truth (as above defined) can be elicited by any process of reasoning.
"It