The question here is of logic. The question is between Lord Bacon and Aristotle, and which of these two thrones and dominions in speculation and practice the moderns are disposed on the whole to give their suffrages to, in this most vital department of human practice, in this most vital common human concern and interest. The question is of these demoniacal agencies that are at large now upon this planet—on both sides of it—going about with 'tickets of leave,' of one kind and another; for the logic that we employ in this department still, though it has been driven, with hooting, out of every other, and the rude systems of metaphysics which it sustains, do not take hold of these things. They pay no attention to our present method of reasoning about them. There is no objection to syllogisms, as Lord Bacon concedes;—they are very useful in their proper place. The difficulty is, that the subtlety of nature in general, as exhibited in that result which we call fact, far surpasses the subtlety of nature, when developed within that limited sphere, which the mind of man makes; and nature is much more than a match for him, when he throws himself upon his own internal gifts of ratiocination, and undertakes to dictate to the universe. The difficulty is just this;—here we have it in a nut-shell, as we are apt to get it in Lord Bacon's aphorisms.
'The syllogism consists of propositions; these of words. Words are the signs of notions: notions represent things:' [If these last then]—'if our notions are fantastical, the whole structure falls to the ground. But [they are] they are, for the most part, improperly abstracted, and deduced from things,' and that is the difficulty which this new method of learning, propounded in connection with this so radical criticism of the old one, undertakes to remedy. For there are just two methods of learning, as he goes on to tell us, with increasing, but cautious, amplifications. The false method lays down from the very outset some abstract and useless generalities,—the other, gradually rises to those principles which are really the most common in nature. 'Axioms determined on in argument, can never assist in the discovery of new effects, for the subtlety of nature is vastly superior to that of argument. But axioms properly and regularly abstracted from particulars, easily point out and define NEW PARTICULARS, and impart activity to the sciences.'
'We are wont to call that human reasoning which we apply to nature, THE ANTICIPATION OF NATURE (as being rash and premature), and that which is properly deduced from THINGS, THE INTERPRETATION OF NATURE.'—(A radical distinction, which it is the first business of the new machine of the mind to establish). 'Anticipations are sufficiently powerful in producing unanimity; for if men were all to become even uniformly mad, they might agree tolerably well with each other,' (but not with nature; there's the trouble; that is the assent that is wanting).
'In sciences founded upon opinions and dogmas, it is right to make use of anticipations and logic, if you wish to force assent, and not things.'
The difference, then, between the first hasty conceptions and rude theories of the nature of things,—the difference between the preconceptions which make the first steps of the human mind towards the attainment of truth, and those conceptions and axioms which are properly abstracted from things, and which correspond to their natures, is the difference in which science begins.
And we shall find that the truths of science in this department of it, which makes our present subject are quite as new, quite as far out of the road of common opinion, and quite as unattainable by the old method of learning, as those truths with which science has already overpowered the popular notions and theories in those departments in which its powers have been already tested.
These rude natural products of the human understanding, while it is yet undisciplined by the knowledge of nature in general, which in their broadest range proceed from the human speciality, and are therefore liable to an exterior criticism; these first words and natural beliefs of men, through all their range, from the a priori conceptions of the schools, down to the most narrow and vulgar preconceptions and prejudices of the unlearned, the author of the 'Novum Organum,' and of the 'Advancement of Learning,' by a bold and dexterous sweep, puts quietly into one category, under the seemingly fanciful,—but, considering the time, none too fanciful,—designation of 'the Idols';—(he knew, indeed, that the original of the term would suggest to the scholar a more literal reading),—'the Idols of the Tribe, of the Den, of the Market, and of the Theatre,' as he sees reason—scientific, as well as rhetorical reason,—for dividing and distinguishing them. But under that common designation of images, and false ones too, he subjects them to a common criticism, in behalf of that mighty hitherto unknown, unsought, universality, which is all particulars—which is more universal than the notions of men, and transcends the grasp of their beliefs and pre-judgments;—that universal fact which men are brought in contact with, in all their doing, and in all their suffering, whether pleasurable or painful. That universal, actual fact, whose science philosophy has hitherto set aside, in favour of its own pre-notions, as a thing not worth taking into the account,—that mystic, occult, unfathomed fact, that is able to assert itself in the face of our most authoritative pre-notions, whose science, under the vulgar name of experience, all the learning of the world had till then made over with a scorn ineffable to the cultivation of the unlearned. Under that despised name which the old philosophy had omitted in its chart, the new perceived that the ground lay, and made all sail thither.
We cannot expect to find then any of those old terms and definitions included in the trunk of the new system, which is science. None of those airy fruits that grow on the branches which those old roots of a false metaphysics must needs nurture,—none of those apples of Sodom which these have mocked us with so long, shall the true seeker find on these boughs. The man of science does not, indeed, care to displace those terms in the popular dialect here, any more than the chemist or the botanist will insist on reforming the ordinary speech of men with their truer language in the fields they occupy. The new Logician and Metaphysician will himself, indeed, make use of these same terms, with a hint to 'men of understanding,' perhaps, as to the sense in which he uses them.
Incorporated into a system of learning on which much human labour has been bestowed, they may even serve some good practical purposes under certain conditions of social advancement. And besides, they are useful for adorning discourse, and furnish abundance of rhetorical material. Above all, they are invaluable to the scholastic controversialists, and the new philosopher will not undertake to displace them in these fields. He steadfastly refuses to come into any collision with them. He leaves them to take their way without. He makes them over to the vulgar, and to those old-fashioned schools of logic and metaphysics, whose endless web is spun out of them. But when the question is of practice, that is another thing. It is the scientific word that is wanting here. That is the word which in his school he will undertake to teach.
When it comes to practice, professional practice, like the botanist and the chemist, he will make his own terms. He has a machine expressly for that purpose, by which new terms are framed and turned out in exact accordance with the nature of things. He does not wish to quarrel with any one, but in the way of his profession, he will have none of those old confused terms thrust upon him. He will examine them, and analyze them; and all,—all that is in them,—all, and more, will be in his; but scientifically cleared, 'divided with the mind, that divine fire,' and clothed with power.